It's not a spell, but Blessing of the Trickster from the trickster cleric also got concentration added to it. Which sucks, because it's one of their best features, and you can usually use it in tandem with pass without a trace to make sure even your heavy armor wearer will pass their roll.
That makes me mad, there's enough things in this game that have concentration on them without Larian adding it to random things.
Don't add concentration to things larian! You're making it worse!
