Very frustrating. This mutation just killed me again, despite taking efforts to try and avoid it!
I had a level 21 MdFi, with lots of great artefacts.. wearing an amulet of resist mutation due to my fear of getting beserkitis!. I got a yellow GLOW, which gave me two mutations (reduced hit points and some other minor thing).. I had a potion of cure mutation on me, which I drank to get rid of them.. a couple of turns later, I get the beserkitis mutation!! Then on my way back to my stash for another cure potion, I ran into a mob and beserkitis + Khufu's smite killed me.
My lessons here were;
1) don't waste a slot on a resist mutation amulet - its apparently useless?
2) take a risk & carry more cure mutation potions...
3) not to drink the cure until the yellow glow has gone
My 3rd decent melee character this week to be killed by beserkitis. I'm going back to casters for a bit.