Eye of Vortex is the 3rd dungeon in the Xelorium dimension. This dungeon is intended for level 200 characters.
Recipe to craft the key:
Two challenges are required for the Vortex achievements:
Impertinence: Finish your turn on a cell adjacent to an enemy.
Focus: When an enemy is attacked, they must be finished off before any other enemy is attacked. Focus fails if you hit an enemy or enemy summon after another enemy or enemy summon has been hit.