Giving mobs loot

[marksk]

I don't run a server but I am a GM on one. I like to run little events in the planes where i'll spawn a bunch of mobs and then spawn Bertoxxulous or whatever. THe problem I have is, how do i give the mobs loot? The only thing i've tried so far is handing them the items I want them to drop (stone of gnoming, hehe)but they never drop it. Any ideas? Edit - one more question. Say, i want to spawn Rallos Zek the Warlord in The Nexus or some old world zone. Is this possible if i'm not the owner of the server? Thanks for the help !