ToME: the Tales of Maj'Eyal

I had a positive healing mode (>120%) and life regeneration (>3). Suddenly they are bad--51% and -4 respectively. Why?

It is not the equipment (switched all). It is not the dungeon (I was in the dungeon a long time before it happened; also tried new one).

Can certain monsters permanently destroy character's healing mode and life regeneration?

Character (if useful): level 50 human summoner; version insane.

With weak healing the character becomes virtually useless in the endgame.

It has happened two or three times in the past. I ended up discarding these characters--not only are they weaker, but even using recall is tedious (resting no longer works).

Anyone know what is going on?

Did you have multiple Goedalath Rocks?

That was the problem. Thank you.

(I had them in storage room, picked them up to put in the vault, and forgot to do it.)