You are killing Light Watcher 's that spawn from Skiggit. Do not Kill Skiggit if you want these to keep spawning. Skiggit does respawn within 30secs to a minute usually if killed though. Best to get a group to do this and CC Skiggit while the rest AoE the Light Watchers.
Light Watchers have 3,900 hp and Skiggit has 2,400,000 hp.
You get [item]49655[/item] VERY FAST!
You can do this while in a party and even a raid!
Lovely Charm Farm Spot has been hotfixed during "realm hiccups" see what u did there @BlizzardCS