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Well, I need to know the concept of Monster Mask before trying to give you ideas, Aero. If you want a completely different item, it's another history though.
Now, about bugs:
Old bug, but it's not fixed yet. Chill of the Frost Master is still bugged. The allies are healed normally, but sometimes enemies are healed instead of receveing damage. Why it happens with some enemies and not all of them is a mystery to me.
PS: I'm gonna kill myself. I always pick at least one bugged skill per gameplay
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