I think that Samael Lashnaveous' quest in the Hallway of Hope is not working as intended. When I accept the quest, my journal is not updated, and I cannot open the grate. This is with a paladin character.
If this is an IG puzzle, rather than a bug, I apologize.
Correction: My journal was updated with the following:
ERROR, Blank Journal Entry: ar_del_nduru
This is a Confirmed bug. I killed all the spawns and nothing happened.