Just before reaching the last boss, after killing the 2 giraffes (Dhalmel ?), there is a last area where you fight multiple adds and dance around the geysers.

At some point, some vulnerability debuff may be thrown onto the party members and they are extremely nasty to heal. Moving the adds back to the ground instead (where you fought the giraffes) will let the debuff apply but without doing ANY damage.

Help your healers please. It's just a few steps to make.