Item drop chance...

Hello Nostalrius Team,
I got a question and i hope u guys could give me an answer. I did with my Mage about 21 times Omokk from the Lower Blackrockspire and i tried to finish the Upper Blackrockspire Key Quest, but he never dropped even once the Gemstone of Spirestone, so now my question: Could it be, that this dropp is bugged?
I´ll looking forward to get an answer soon.
Greetings
Coraxion lvl 60 Troll Mage, Nostalrius PvP
I got a question and i hope u guys could give me an answer. I did with my Mage about 21 times Omokk from the Lower Blackrockspire and i tried to finish the Upper Blackrockspire Key Quest, but he never dropped even once the Gemstone of Spirestone, so now my question: Could it be, that this dropp is bugged?
I´ll looking forward to get an answer soon.
Greetings
Coraxion lvl 60 Troll Mage, Nostalrius PvP