That must lead to some awkward roleplay at times. My draenei monk for example still keeps the light close to him but he focuses on spiritual training more.
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I suppose, I was more thinking of how the light effects those close to it in their undead state. We were originally told it burns them, however like to say with characters like zeliak and Carlia using the light without issue it really falls more on blizzard to explain why these undead don't burn up from it.