Find and Kill Achidna | Small quests Darksiders 2 Guide
Last update: 11 May 2016
Unlocking the quest
The quest can be unlocked in two basic ways. The first one is to defeat Thane during [The Maker Warrior] side quest. After winning the duel, you can receive a commission to kill Achidna along with three other monsters. The second way is to find Achidna without the involvement of Thane, at which the quest will automatically appear in your quest log. You won't have to take the quest from Thane first, but simply kill Achidna and go to the Ancient to receive your reward.
Find and Kill Achidna
Among the four monsters Thane wishes dead, Achidna is by far the easiest to find. She resides in [Psychameron] in the Kingdom of the Dead, and fighting her is part of the main quest [Basileus] - you couldn't miss her even if you tried. Detailed instructions of how to kill Achidna (and the accompanying Basileus) can be found in the section describing the aforementioned main quest.
Return to Thane
Return to [Tri-Stone], initiate a conversation with Thane and tell him you had killed Achidna. The primary rewards for this side quest are 603 XP and 3000 gold, although killing Achidna also gives you a new rare weapon, Achidna's Fangs.