I just had an idea. what if we worked the helm like this?
Quote:
GLYPH OF HELM OF INVISIBILITY
(Intangibility)
EQUIPMENT GLYPH
A figure equipped with this glyph can move through all figures, is never attacked when leaving an engagement, and cannot be targeted by opponents' non-adjacent figures for any attacks or special powers that require clear sight for the remainder of its turn unless it has the Hades' Helm special power.
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This way it still works against certain special powers, but they don't know how to use it properly unless the use of it is inherent to them. I know the wording isn't perfect, but it gets the point across.