Critical bug with Solo Duty in 2.0 Main Story quest 'The Heretic among Us'

[An_IRL_Rabbit]

Date & Time: Always
Frequency: Always

NPC name: Drillemont
Monster name: Inquisitor Guillaime
Party or solo: Solo
Area and coordinates: The Heretic among Us, instanced solo duty

Steps:
The enemy NPC during the solo duty, Inquisitor Guillaime, uses the wrong version of Ruin 2 after the Arcanist/Summoner rework.

Instead of what he used previously, he now uses the player version of Ruin 2, and consequentially does way too much damage. He hits the mission-critical ally NPC Drillemont for 550-600 damage per cast, which is about 20-30% of Drillemont's HP (and will likely kill the player in 4-6 hits if he focuses on you), and the allied NPC healer cannot keep up with the damage. Drillemont dying causes the duty to automatically fail, and it reaches this point after less than a minute into the duty.

This behavior is consistent across Normal, Easy, and Very Easy difficulties.

I believe this duty is currently impossible to complete on Normal or Easy because of it; it may be possible on a Healer by also healing Drillemont, but I have been unable to test this.

I was able to complete it on Very Easy only because I was able to do enough damage to push the Inquisitor past the HP threshold he needs to reach to transform into his dragon form before he was able to kill Drillemont, and even then, Drillemont was one or two hits from dying by the end of the duty.

[Karatecatgrl]

May I ask what gear were you using?
This is 100% doable if you are at the expansion max level with the augmentated poetics gear for that expansion.

This seems like the NPCs are working as intended.

Summoner fights are meant to be a DPS race. If you are having a hard time level up and then get the gear and go back to your class quests. You'll be fine without the spells until then.