From the Rumuba's Jade Spear Quest quest, introduced during the Should the Stars Fall event.
Purchased at Vendors.
Rumuba Rumor
A rumor about Rumuba the Mosswart. 1 of 1 pages full.
Out in the jungle, somewhere between MacNiall's Freehold and the weaklings settlement, there is a cave guarded by idol-worshipping Mosswarts. If one can fight past them, there resides in the caves deep reaches a tame, intelligent Mosswart who calls himself Rumuba. It is difficult to understand what the little creature says, but he seems to be at odds with his brethren and may be seeking the aid of humans.
-- Onda Nakoza