There are two "reflective" cloaks in the game. Cloak of Reflection protects the wearer from 100% of electrical damage only. Cloak of Mirroring protects the wearer from spells (except Imprisonment and Maze).
Elder Orbs can cast Imprisonment. If you haven't been Imprisoned by one throughout the whole game, you have been exceptionally lucky...
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Now where did I leave that doughnut?!