Should I Kill Mystic Carrion?

When It Makes Sense

• Good fit: Your party follows a good or heroic path and you want to free Thrumbo and the other cursed servants rather than serve an undead master.
• Good fit: You already have the spellcasting gear you need, or you value boss loot, experience, and removing an evil NPC from the world more than the unique ring reward.

When You Should Avoid It

• Warning sign: You want the Annals of Karsus, a legendary ring that grants a once-per-long-rest ability to know every spell for a round; it is only available by completing Mystic Carrion’s quest on his terms.
• Warning sign: Your party is low on healing, restoration magic, or radiant damage, which makes a mummy lord fight with disease and undead summons risky.

Pros and Cons

Pros

• Frees Thrumbo and resolves the questline with a morally clean outcome, earning approval from good-aligned companions.
• Yields boss loot, combat experience, and removes a powerful evil NPC who can no longer threaten other characters in the city.

Cons

• Locks you out of the Annals of Karsus legendary ring, one of the strongest caster items in Act 3.
• The fight can be difficult and multi-phase, especially if you do not locate and destroy Mystic Carrion’s hidden heart jar that lets him regenerate.

Decision Checklist

• Have you searched the Ancient Lair or related areas for the hidden jar that anchors his regeneration?
• Does your main character or a companion benefit more from the Annals of Karsus ring than from the loot and XP of killing him?
• Are you prepared for a boss encounter involving disease, necrotic damage, and summoned undead minions?

Alternatives to Consider

If you are unsure, you can initially agree to help Mystic Carrion to learn the quest details and locate the hidden jar, then turn on him once you are prepared. You can also side with Thrumbo to free him without immediately fighting the mummy lord, or simply walk away and return later when your party is stronger or better equipped. A popular middle path is to accept and complete his task for the ring, then kill him afterward if your conscience or roleplay demands it.

Final Recommendation

For most good-aligned or story-completionist playthroughs, the best path is to locate Mystic Carrion’s hidden jar, then kill him to free his servants and remove a dangerous undead threat. If you are optimizing a spellcaster or want a unique legendary reward, consider helping him first, taking the Annals of Karsus, and dealing with him later. Because quest rewards and enemy behavior can change with game updates, double-check your current quest log and any recent patch notes before committing.