NPC Spawn Issue: a froglok nokta shaman

[Nen]

Name: a froglok nokta shaman
Zone: Upper Guk

He drops the Globe of Shadow for the necromancer Robe of Enshroudment. I've been at his camp for a combined 10 hours, seen him 5-6 times and he hasn't dropped the Globe. Just my opinion but it seems exceedingly rare for what it is. Feel free to disagree! Just saying. :P

<3

EDIT: Oh, here is the Alla link. It says the Globe is supposed to be Common.

http://everquest.allakhazam.com/db/item.html?item=2872

I don't think its supposed to literally drop every time though.