The Lightless Remnant Quest. There is another thread on this from 2015 that is locked. But it needs to be mentioned again because it's never been addressed (read fixed). The quest tells us to destroy the statues. But it doesn't tell us how. I've been two days trying to figure that out. I finally succumbed and went online to get the answer.
Lead a gargoyle to a statue. The gargoyles will destroy the statues.
IMO, Unfortunately, things like this taint an otherwise great game. I have run across many such omissions.