Frost Reflector trinket does not make you immune to aoe frost effects like nova and coc.
https://youtu.be/6818CkXqies?t=13m48s
Most abilities that involve nullifying spells don’t work on AOE, like grounding totem, I’m pretty sure that’s just how it’s supposed to be.
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As others have said, this is working as intended. I’m guessing you were a pserver player because the reflector worked on nova those. Unfortunately that was a pserver bug though.
Ty for feedback