[Castigate]

The problem with this sort of agreement on Drusella is its literally a camp. No variance, no FTE message, room full of mobs to clear, spawns inside a dungeon, you just kill the mob when it spawns.
It fits every definition of a camp that I can think of, and I'm happy as fuck that I got my urn when she was still spawning at 5:30am instead of prime time.
Another rumble will happen at some point though, and that will change her spawn timer, and eventually people will lose track of it allowing others to swoop in.

Also the fact that its a rare drop further complicates any sort of roll idea.