I noticed that in the fight in the beholder lair, some enemy (grey ooze) explodes when dead.
I put a elemental sonic resistance on a character because he was frail in HP and not ideally placed... and it didn't change the damage received.

=> monster dead, death throes starts:

The spell i cast previously is not accounted (8HP is the "normal" amount like he would receive i think because when a save is made, the number is in purple not green, and i assume it would be identical for a dmg resistance bonus in HP calculation? [edit : or not. I don't get why i can't see the damage calculation in that printscreen]).