I've Officially Done a Playthrough of all 10 Mythic Paths, here's my Review of Each and a Rating of their Strength (Spoilers) from Pathfinder_Kingmaker
Start heading for the surface. Before you get there you'll encounter Irabeth, an orc that's just gotten done fighting and Anevia's wife. After she explains the importance of the Wardstone to you, you'll join forces to take down the cultists in the area. Buff up, then follow Irabeth (note: all side doors will be inaccessible, with the exception of the one near the second floor stairs).
If you use the Angel Mythic Path reaction, you will convert a few of the minions to your side before the fight starts.
If you use the Demon Mythic Path reaction and fail your Will save, you'll go into a rage and attack Staunton. (Talk to him about this back at Defenders' Heart later and he'll give you Cloak of Unbending Will.) Either way, she'll end up knocking you out and resume her plan to use the Wardstone for her own ends.
- Outside your room, talk to Anevia to trigger The Divided City.
- Chat with Staunton Vhane (adjacent to Avenia) and he'll point you to Blackwing Library where you might find the Storyteller you seek. Spitting in his face won't bother him, if you want to play evil.
- Horgus at the bar will give you your reward for taking him to the surface. He'll also offer you a bodyguard job (for the same money).
- Ask the bartender (Gemil Hokks) if there's anywhere worth visiting and he'll direct you to Pitaxian Wine Cellar. He'll also sell Dark Omen (ring), Gloves of the Neophyte, Dark Veil (item), and Spicy Pastry (recipe).
- Jernaugh in the room behind the bar can point you to Chilly Creek
- You can hire mercenaries or respec via Hilor if you like
- Forn Autumn Haze near the basement stairs wants you to find and kill a cultist named Kaylessa (The Outcast).
- Downstairs you'll find Woljif. Tell Irabeth about him to free and recruit him (Out on Parole). Doing so will earn you 180 XP, reveal Thieflings Hideout on your map, and trigger Stolen Moon.
Market Square
- After you enter the area, walk slightly west and take out the Abrikandilu, then pass the Athletics check to assemble a bridge from the rubble and complete A Divided City. Buff if needed to pass the second Athletics check ("get across the rubble"), and continue north to fight a Fiendish Giant Fly and Centipede. After defeating them, look for the pile of junk. Pass the Athletics check to earn 80XP and minor loot. Speak to Grandma Gretlen afterward to earn 80XP.
- In the northeast corner you'll find a cemetery and some ghouls, as well as a grave containing Throwing Axe +1 (Perception DC20).
- In the north center of the map you'll find Curl checking out some bodies among the rubble. After speaking with her, Jannah will show up (A Friend in Need Is a Friend Indeed). Slightly south, pass the Mobility check ("use the trunk")
- Northwest you'll run into Counter Arendae's Servant, who will point you to Arendae Party House (No Better Time For a Banquet). Later, head there on the world map and defeat the enemies. Loot the room to acquire Decimation, then speak to Aranka to receive Aranka's Shawl followed by Daeran (the latter of which will join your party). Tell him you want gratitude to receive Arendae Family Ring. (Talk to Ramien and Ilkes before Aranka to receive the Starward Gaze quest and subsequently, the shawl.)
- Once you have the shawl from Aranka, return to Market Square to find Kenabres Crusader (Thall the Wallflower) at the entrance and give him the shawl, after which the Inquisitor will show up and arrest him. Defend Thall, who will thank you later. If you show the Light of Heaven to Hulrun (an Angel Path mythic reaction), it will convince Hulrun to leave Thall alone automatically. Then, go northwest to the Temple of Desna. Inside, your friends will teach you a song (which you can use later to recruit Arueshalae early). If you join in on the song, you'll have the opportunity to become an Azata. Either way, you'll receive 460XP and Wand of Remove Disease. (Starward Gaze will complete now.)
- In the northwest corner of the map (slightly east of the Temple of Desna) you'll find a house with a chest next to it. Disarm the trap inside then enter the basement. Take See Invisibility scroll from the body. Buff your party and equip any magical or Good or Cold Iron weapons, then use the See Invisibility scroll to reveal Shadow Demon. Focus it with the aforementioned weapons and magic. After it dies, pass the Athletics check to clear the blockage in the corner. Unlock the chest to find Wicked Longbow.
- On the west side of the map there is a scrawny tiefling trapped under some rubble next to a church. Free him to earn a little XP and learn about a secret entrance to Gray Garrison.
- Slightly east of Temple of Desna, you'll find some loot amongst the trees adjacent to a building. Prepare your party (ensuring your frontline formation has at least two party members next to each other on it to avoid being caught flat-footed) then take the loot to trigger an encounter with a Babau. It hits hard but if you're buffed and have good formation, you'll be fine. Take Cold Iron Shortspear +1 from the body.
- In the east central area you'll run into a few ghouls and cultists (one of which will proclaim their true passion is raising undead). Wipe them out (Grease is handy), then loot Dark Horn from the bodies.
- Around the center of the map (somewhat east of the central west exit), look for a wooden cart and rainbow coloured decorations. Loot Midnight Bolt from a board leaning against the cart.
- At the south central portion of the map (look for the "Mongrel" marker), take out the Schirs and loot the bodies to find Club with Nails.
- In the southwest corner of the map you'll find a small house containing Brimorak. He likes to lob fire spells at you so Fire resistance will help a great deal here. Offensively, go with cold spells, anything that targets Reflex, and Good or Cold Iron weapons. Afterward, loot Signet of House Vespertilio, Piece of a Holy Symbol, and Abrupt Force from the bodies and chests.
- Look for the mongrels on the south side of the map center who will agree to form a pincer attack in the upcoming fight if you ask them. (Unless you killed Hosilla immediately, in which case your options are don't talk to them, fight them, or intimidate them into working for you.)
- In the southeast corner you'll find Kaylessa collapsed on the ground near the tower by the area exit (The Outcast). Pass the Perception check and you'll find she does in fact hate demons, though is holding back on you. Let her go and you'll earn 184XP; kill her to receive Composite Longbow +3 (likely the best bow you'll see for awhile) or a Leather Armor +2 (if you do not have The Outcast as an active quest).
- In the southeast corner (slightly west of Kaylessa) you'll encounter Ember being attacked by crusaders. Convince them to stop and they will; free them and Ember will be pleased (and join your party). Inside the house, take out the rat swarms and disarm the trap, then loot the area for Hide Armour +1 and Seasoned Wings and Thighs (recipe). Pass the Arcana check in the back room (behind the shelf) to summon the demon Vrock, who will promptly vanish to the center of Market Square (it won't yield anything notable in the way of loot).
The Divided City
During The Wardstone Legacy, speak to Anevia to prompt this quest, which will send you to Market Square.
Once the soldiers have been dealt with, ask Ember to join you and she will.
Feud of the Faithful
Talking to Ramien will reveal a third option (broker peace between the two) as well as a quest (Starward Gaze). Be sure to resolve this quest peacefully and sing the song if you want to recruit Arueshalae early.
If you fight Ramien, he will vanish and you will fight Ilkes in his place (an easy fight that won't yield any notable loot). Return to Hulrun with the news to earn 530XP and complete the quest (460XP). If you attempt to broker peace and did not show the Light of Heaven to Hulrun earlier, Hulrun will simply attack you and you'll acquire Longsword of Right. Return to Ramien with the news to earn 530XP and complete the quest. The Clerics of Desna will join the crusaders if you ask him to head to Defender's Heart (A Common Cause).
Credit for mythic reactions in this guide goes to Ranadiel, who has generously provided it with permission.
Stay of Execution
Eventually, while wandering the world map (or after resting in Defender's Heart), a Messenger will approach you and announce Defender's Heart is being attacked by demons. Make sure you're fully rested, have Grease, and buff up your main character beforehand, because you'll need it.
Before the battle begins, get to know your companions. Learning more about Elan will trigger The League of the Inspiring Cart. If your deity is Cayden Cailean, you have unique conversation options with Irelia here: due to defending a bar (drunk god), you receive a +4 morale bonus on all skills and attacks for an hour which will help greatly in the fight to come. (Thanks, Nathan.)
Note: if you lose the fight, the game won't end, but your fight for the Wardstone will be much harder now as you've lost half your fighters and had your arsenal raided.
Phase I: West Gate / Arsonists
Have everyone hold the west gate, using Grease to keep the enemy down at the choke. Have ranged characters focus anyone on high ground. Kill Arsonists as soon as possible
On higher difficulties, you may want to position all but your main tank and a ranged/melee character behind the Crusaders in front of the tavern, using them as your frontline. The tank and ranged/melee you should position on the high ground where the enemies spawn and have them use ranged attacks whenever any Arsonists are on screen (if you don't kill them asap, you will lose), and melee when there aren't. Buff them when you get a chance.
After taking down a bunch of enemies, more will approach the wall and begin to climb the ladders.
Continue with your plan, still taking special care to kill the Arsonists as soon as possible, of which there will be more now.
Phase II: Minotaur
Phase III: Cleanup
Aftermath
Post combat you'll confer with Irabeth and receive 690XP, Bite, and Heavy Flail of Weakness. Before you leave, chat up your comrades and grab some gold and supplies.
- Anevia will point you to Topaz Solutions.
- Indarah will give you Claw of Jistka if you pass one of the conversation checks upon engaging her in debate. However, you will receive both the claw and Power Fist, the Gauntlet of Punching if you don't pass the check and ask Pink Eye to answer. (Thanks, Den.)
- Vissaliy will help you with your dreams problems (Days of Strife), earning you 150XP. He'll also sell you scrolls and crafting supplies. It's recommend you pick up Icy Protector now, as it's a potent ring you can't get until much later if you don't get it now.
- Talk to Nenio to progress More Than Nothing.
- Tell Forn Autumn Haze about Kaylessa (The Outcast). If you freed her, you'll earn 69XP and Forn will commit to hunting her himself.
- Loot the cart outside for 1254GP.
- Joran Vhane in the yard will sell you wares.
Gwerm Family Secrets
In the northeast room with the Abrikandilu, loot Onion Soup (recipe) from the chest. The Abrikandilu itself will go down a little easier with cold iron weapons; Barkskin on your front liner will help as well.
In the southeastern-most (locked) room, loot Sickle of Falter as from the chest.
To the west you'll find the stairs to the second floor. Before you head up, kill the two Cambions in the room south of the stairs and take Silver Robe from the chest.
Defeat another Abrikandilu in the northwest room and take Magic essence from among the loot.
Killing them both will end the quest here and yield 1000G, Headband of Alluring Charisma +2, and whatever loot Camellia had on her. Letting them live with net you 2000G and 460XP. Lockpick the armoire in the back for Breastplate +1.
Spies Amidst Our Ranks
After the fight, loot Buckler +1 from the rubble near the right column (Perception 16 check required), as well as Heavy Mace of Fire from the bodies.
Loot the surrounding rooms for Entrapping Longbow, Grace of Peace (kukri), Magic essence, and Lady Callandra's Chainshirt.
In the back east room you'll find Teldon. Convince him to hand over his keys or otherwise steal them or kill him (though as the loot is missing from this area, he won't yield anything for killing him). Send him to Defender's Heart while you're at it (if you don't kill him).
Tell Irabeth what you've learned for 529XP, completing the quest.
The Burning City
Head west to Blackwing Library. Upon arrival, buff your party, then speak to Chaleb, who seems to be in the middle of a slaughter. If Defender's Heart has not been attacked yet, the tied up people can be saved. Otherwise they will already be burning, and only the Storyteller will survive. Pass the Perception check for 11XP and to learn he's lying; pass the Religion check for 11XP and to observe his armour doesn't match up with his captaincy claim. Fail the Athletics check (a Lawful action) and the true crusaders will die; succeed the Athletics check to earn 24XP and to remove the flask from the alchemist, thus saving the true crusaders. A third option is exclusive to Trickster; it will avoid you a fight. If you don't choose the Trickster option, you must fight now. Slumber + Coup de Grace will again be helpful here.
Loot the area to acquire a handful of important books and Padded Armor of Focus. In the rear right corner, a Perception 20 check will reveal a secret door. Inside, take Magic Essence and Quarterstaff of Coercion.
Travel to Market Square and look for an interaction icon north of Hulrun/directly south of the "house" marker among some rubble. This is the "place where Terendelev died", and it's where you'll become an Aeon (if you desire). Either way you'll receive Purple Stone Knife.
Return the knife to the Storyteller to complete the quest. Show him Terendelev's Scale (from Devoured by Darkness) to trigger The Fifth Crusade.
Gray Garrison
Make a hard save now as there's no going back.
Once you've dealt with everything else, speak to Irabeth to begin your attack. Once inside the Gray Garrison, you should receive a Haste buff if you saved the crusaders during The Burning City (you may have to speak to them in the tavern afterward). (Thanks, AaronKorr.)
Take out the cultists and ignore the magic door in the back room for now. Go up the second set of stairs. After the Vermlek's take a nap, Coup de Grace 'em.
Wipe the enemies in the next area out (above where Irabeth and her soldiers are fighting), then take the north stairs down (note the blood on the walls).
The next (locked) room over you'll find Lesser Sonic Quiver and Razor-Sharp Claw. Across the hall, pass the Athletics check and enter the room to fight Abrikandilu and acquire Magic Essence.
Second floor
Take the northwest stairs to the second floor now. Take out the two Schirs with Coup de Grace, then buff like crazy before entering the left room with Jeslyn and his minions. This is one of those fights that can be very difficult if you don't respect the almighty power of doors and very easy if you do. Position everyone but your main tanks a ways behind the door (not in the room where the enemies reside) and send your main tanks in to trigger the fight.
Post-combat, loot Befouled Key, Dark Glowing Scythe, Amulet of Natural Armor +2, and Cloak of Resistance +2.
Passing a Perception 25 check near the chests at the end of this room will reveal a hidden room behind them. Loot it to acquire Bulky Pick.
In the north center room with the cultists and the blue door, loot The Collapse from the bodies. Lockpick the blue door to acquire Mordant Waraxe.
- The Demon Mythic Path reaction results in the "doings of mortals" being of no concern anymore to the aeons. Also, you will keep your Purple Stone Knife.
- The Angel Mythic Path reaction of quelling the anger will end the battle within the Wardstone and allow you to keep the Purple Stone Knife.
- Destroying the stone and the Angel Mythic Path reaction of cleansing the stone will cause you to lose Purple Stone Knife (making the best ending more difficult to obtain).
- The Aeon Mythic Path reaction will also destroy the Purple Stone Knife, but it is possible to get a replacement later in Chapter 5 for the Aeon Mythic path. It is also the only option available if you unlocked the Aeon Mythic Path and want to keep it open.
Next up, fight Minagho at last. Since you're imbued with Mythic powers, the fight will be a slaughter (in your favour). Afterward, Staunton will show up to rescue his woman. The good and evil dialogue options will have no effect here: he'll set off with her regardless.
Obtain your Mythic abilities, then exit back to Defender's Heart via the door to end the chapter.
Credit for mythic reactions in this guide goes to Ranadiel, who has generously provided it with permission.
Cold Waters
Progress Sword of Valor until you have access to Chilly Creek (northeast of Kenabres), then head there and meet with Jernaugh.
Loot the chest behind the hydra to acquire Oppressor's Gloves. Further back, in the north corner of the village, take Godspeed Salad (recipe) from a chest.
Head to the world map via the southwest exit.
The Outcast
Forn Autumn Haze near the basement stairs in the Defender's Heart tavern wants you to find and kill a cultist named Kaylessa.
Travel to Market Square. In the southeast corner you'll find Kaylessa collapsed on the ground near the tower by the area exit. Pass the Perception check and you'll find she does in fact hate demons, though is holding back on you. Let her go and you'll earn 184XP and meet her later.
As of 11/4/2021, the final part of this quest appears to be bugged. It asks you to make a decision about Kaylessa's final request and points you to Drezen, but the quest will complete if you simply allow some time to pass. For your efforts you'll earn 230XP.