Illusens Potion
Illusens Potion is a weapon that is a reward for completing a quest for Illusen at level three.
As a Weapon
Illusens Potion is a once per battle weapon that does two icons of earth and two icons of light. Because Illusens makes it so widely available, it can be bought cheaply, but it is considered a weak battledome weapon and is not frequently used. Fighters usually prefer the slightly more expensive Caustic Potion or Mud Mixture instead.
External Links
In-Depth Battlepedia: Illusens Potion