Official notes
Official wiki for this creature. Official news wins.

The late metal.
Lithkren late metal. QBD stays on Bosses.
Slayer · Old School RuneScape
Lore
The late metal. Lithkren. Antifire and prayer. Confirm the floor. This is the Dragon Slayer II sentence, not a Taverley lap.
Where
Lithkren Vault
Assigned by Old School slayer masters (Chaeldar through Duradel, and Konar). The live page lists who.
Hunt
The late metal. Lithkren after Dragon Slayer II. Antifire and prayer. Confirm the floor.
Watch
Task-only doors, face covers, and cannon-blocks are on the live page. Confirm on the wiki.
Kill
A kill ends when rune dragon 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 a slayer floor as a raid invocation. Counts, drops, and the living method: the Old School wiki for this hour.