I was in Najena, had just finished a difficult fight, and was low on health. I tried to summon bandages, hit the wrong key, and instead nuked myself to death. Not my finest moment
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When I respawned, strangely I had no mana! I did have full health, as I should though.
I can only assume this was some sort of side effect of me killing myself, as I can't think of any other detail (eg. having a pet up, being in Najena) that could have caused it.