"... Apparently, that MXP Totem was keeping me just at the edge of serious mana-burn levels this whole time, so even thinking about casting a spell was enough to push things over into the danger zone. And the mana suppressant potions weren't designed to hold against sustained mana-toxicity levels like that -- so, I get spellbound. Normally they only do this to unicorns who go cuckoo or turn criminal."