Codex Arcanum: Invisibility, Shrink, Third Eye, Water

Avoid combat and blend in with your surroundings by using Invisibility.
Invisibility
Realm: Water
Type: Enchantment
Abilities: Target becomes Invisible.
Tactical Report
Sometimes avoiding combat is the best path for a Guardian. No Spell is handier for such task than Invisibility. Target one character and watch as it fades from view. But such a skill is only as powerful as one trained to use it.
Enemies that can’t see you will be silhouetted in black. Enemies that have Third Eye will appear in full color. So watch out for enemies that can see the Invisible.
Also note that if you attack, activate an switch, open a chest, or pickup an object; you will be noticed. You’ll temporarily become visible, so if you have to do something, do it quickly!