Official notes
Official wiki for this creature. Official news wins.
You already know the room. The creature is the constant. You are the variable.
The creature. Not the room. Bosses have their own page.
Slayer · Old School RuneScape
Where
Wyvern Cave
Slayer
Assigned by Old School slayer masters (Chaeldar through Duradel, and Konar). The live page lists who.
Hunt
Spitting, taloned, long-tailed. Shield as the live page says. Ancient wyvern if treated as a boss stays off this list.
Watch
Task-only doors, face covers, and cannon-blocks are on the live page. Confirm on the wiki.
Kill
A kill ends when fossil island wyvern 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.