So i was doing the quest on my Cleric, since its a great staff. I went all the way to Ak'Anon to get the regurgitonic, so i could get the staff at a lower level. But Mammoth wouldn't take the tonic, he handed it back and didn't give me a scroll.
This is the quest info on Allakhazam:
http://everquest.allakhazam.com/db/item.html?item=491
This is relevant too:
http://everquest.allakhazam.com/db/quest.html?quest=12
EDIT: I realised i posted this in the wrong place, please move it to bugs.