Doom!

[Marek]

So I was in the Gibberling caves slaying the little ape critters one after another while their shamans kept casting Doom upon me. I cleaned out the whole cave, then ventured to the North Hilltop Ruins. I rested and the effect was still active...

So rest didnt fix it. My Paladin comrade's Lesser Restoration didn't fix it, so we made for the temple of Torm where even Torm's Priest was unable. So the only thing that worked, was for me to be slain and resurrected after a battle with a Single DM, which I almost prevailed.

Edit: Could have been Bane spell, as well, I am unsure which it was.