You already know the room. The creature is the constant. You are the variable.
Pit of Pestilence fodder.
Monster · RuneScape
Where
Stronghold of Security — Pit of Pestilence
Not a slayer assignment. Learn the room, then leave.
Hunt
Third floor fodder. Then the giant ones.
Watch
Task-only doors, face covers, and cannon-blocks are on the live page. Confirm on the wiki.
Kill
A kill ends when spider drops. Walk the room if you pulled extras. Reset at the door when the task is done. Wrong prayer or the wrong tile is the wipe. That is the whole file. Do not treat this as an enrage boss. Those sheets live under Bosses. Counts, drops, and the living method: the RuneScape wiki for this hour.