This glitch occurs whenever I stand next to Adyta the Guardian for more than one turn, it uses an ability (I think Stunning Blow triggers it) which causes an error to occur. And when I close all on the error screen it continues to spam my game and causes Adyta to keep using "Stun" which causes me to slowly take damage, until I end ToME in task manager to avoid being killed. The only way I found to killed it was to use Rush and then back away the turn after and the error did not occur.
This also happens with Yvubrenor the Guardian but with the Dirty Fighting Talent.
I don't know if this helps but the character was created in version 1.1.3, so it may be a glitch occurring because of the 1.1.4 update, but probably not.