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The Blade of Frontiers
The Blade of Frontiers is the Companion Quest for Wyll. It is automatically added to the journal when he joins the party inside the Druid Grove.
Objectives
Objectives and journal entries may vary pending story decisions.
- We recruited Wyll, a monster hunter known as the Blade of Frontiers. He is on a mission to kill Karlach, a powerful devil who is a danger to the entire Sword Coast.
- We met a group of paladins who seek Karlach, the very same target who Wyll is hunting. They provided us with her exact whereabouts.
- We located Karlach, who was not the treacherous devil Wyll believed her to be. We resolved the situation peacefully, but Wyll owes us an explanation.
- Wyll spoke ominously about a penance he must face. We should take a long rest when the opportunity strikes; there's clearly a lot the Blade of Frontiers isn't telling us.
- We met Wyll's diabolical patron, Mizora, who was none too happy to find that Wyll failed to slay Karlach. She punished Wyll for his disobedience by turning him into a devil and departed - though it seems likely we'll meet her again.
- Mizora appeared in the form of a projection to inform us that the Absolute cult abducuted an infernal asset of some importance to the archdevil Zariel. We should find and release them - Wyll's very soul hangs in the balance.
- We've delved deep into Moonrise Towers. We should search the area thoroughly - the devil that Mizora asked us to rescue must be nearby.
- Zariel's asset turned out to be Mizora herself. In return for our help, she promised to release Wyll from his pact, but only after six months had passed. She disappeared again - but not before promising she'd find us soon enough.
We've reach Wyrm's Crossing, on the outskirts of Baldur's Gate. We should keep an eye out for Mizora.
- The ceremony is over. We should return to Mizora.
- Mizora asked us to meet her in camp. She has an important proposal to make regarding Wyll's father, Grand Dule Ravengard.
- Mizora gave Wyll a choice. He could agree to an eternal pact with her and Zariel, and she would reveal where his father's been taken and ensure his safe return. Or he could break his pact with Mizora, dooming his father to die in Gortash's secret command centre. Wyll broke the pact, choosing his freedom over his father's life.
- We've retrieved a book called 'The Legend of Ansur'. We should read it.
- Duke Ravengard told Wyll the only way to save Baldur's Gate from the Absolute scourge is to awaken a powerful wyrm called Ansur who sleeps under the city. A tome called 'The Legend of Ansur' is key to finding the entrance to the wyrm's lair.
- After reading 'The Legend of Ansur', we discovered the great wyrm Ansur resides in a secret lair called the Wyrmway. The entrance is apparently located somewhere within Wyrm's Rock Prison, and the notes inside it hint that opening the way involves lightning sparks and torches.
- We defeated the resurrected remains of the great wyrm Ansur. We should return to camp and inform Duke Ravengard.
- With his father's blessing, Wyll announced himself the Blade of Avernus. He is devoted to protecting the Sword Coast from infernal threats by hunting devils, both within the Hells and without.
Walkthrough
Note that Wyll’s story spans the entire game, and has spoilers for all Acts of the game.
Recruiting Wyll
Wyll can be first encountered when he joins the fight outside of the Emerald Grove. Afterwards, the party can find him inside the grove training young Tiefling refugees. He can be recruited to the party, and will explain that he is hunting a devil named Karlach.
Hunt down Karlach
The party can find Karlach down the hill from the Toll House. Karlach can be spoken to and recruited, freed or killed. If Wyll is in the party, the two will have a confrontation.
If Karlach is recruited to the party before speaking to Wyll, he will show up at camp to confront her. Wyll or Karlach can each be asked to leave, be killed, or the situation can be resolved peacefully.
If Karlach is encountered and recruited without Wyll in the party, they will have a confrontation the next Long Rest.
Meeting Mizora
During a long rest, Mizora will manifest at camp. If Karlach was killed, she will gift Wyll the 
Infernal Robe. Otherwise, she will punish Wyll and his appearance will permanently change.
Rescue Zariel's Asset
Mizora will manifest a second time either at camp or the entrance to Moonrise Towers, this time to request that the party rescue one of Zariel's assets, who has been trapped at Moonrise Towers. During this conversation, she can be persuaded to end Wyll's contract in exchange for rescuing the asset.
Zariel's asset cannot be found in Moonrise Towers proper, rather they can only be saved after entering the Mind Flayer Colony. Here, the party can find Mizora herself trapped within a pod in the Tadpoling Centre.
Mizora can be freed from the pod, or killed. However, killing her will also kill Wyll. If the party frees her, she can be persuaded to gift the 
Infernal Rapier to Wyll. If the party also tries to end Wyll's contract, she can relent, but will stipulate that it will take another six months for the pact to end.
Mizora at Wyrm's Crossing
After reaching Wyrm's Crossing in Act 3, Mizora can be found loitering in Wyrm's Rock Fortress or just before the transition to the Lower City. She asks that the party attend Gortash's ordination. Afterwards, she will offer to save Duke Ravengard if Wyll keeps his contract. (See Rescue the Grand Duke for this sub-quest).
The Great Wyrm
If Duke Ravengard is successfully saved, he will give the party a quest to gather the aid of the great wyrm Ansur. Ansur can be found by travelling to Wyrm's Rock Prison. Here, travel down the western passage way to find two dragon sconces. Hit the sconces with electricity damage, then interact to light them. Past the new opening is the Wyrmway.
After the Wyrmway's trials are completed, Ansur can be found and fought. The party can then return to camp to inform Duke Ravengard.
If the Duke perishes, or Wyll breaks his pact, walking around certain parts of the Lower City may trigger Counsellor Florrick to confront the party and accuse Wyll of killing his father. If Florrick is dead or still imprisoned, Cordula Eltan takes her place. If he is in the party, Wyll retorts that this is disinformation being spread by Mizora. Talking the Fist down will result in her providing the necessary information to begin this stage of the quest. If they cannot be dissuaded from attacking, the information can be claimed from the corpse of Florrick or Eltan.
Rewards
Infernal Rapier for freeing Mizora in the Mind Flayer Colony, if Wyll is in the party and persuading her to give the party a reward for their troubles.
Infernal Robe if recruiting Wyll]] and killing Karlach. Mizora will give this on the following Long Rest.
Companion approval
During Mizora's judgment at camp, if Wyll does not kill Karlach
If Wyll is the origin character:
- Defend Karlach from Mizora
+5 - Give up Karlach to Mizora -5
If a character other than Wyll is the origin character:
- Defend Karlach from Mizora
+1 
+1 
+1 +5 - Offer to give up Karlach to Mizora -1 -1 -1 -5
- Threaten Mizora
+1 +1 +1 +1 +1 - Tell Mizora to fuck off +1 +1 +1
+5 +5 - Admire Mizora - "Well, well. Aren't you a luscious thing?" -1 -1
Achievements
Loophole
Break Wyll's pact with Mizora.
Crash Landing
In the Wyrmway, wait until the dragon is mid-flight, then knock it out of the sky - KAPOW.
Bugs
- If the Wyrmway and Ansur are completed before saving Duke Ravengard, Wyll will be stuck saying the party needs to return to camp and tell Ravengard, and will not have other conversation options.