Kill 6 Zan'thik Impalers and 6 Zan'thik Manipulators in Zan'vess.
The warriors of Zan'vess are some of the most feared and respected in the empire, for good reason.
Impalers are unmatched in their mastery of the polearm - no doubt Malik trained among the Zan'thik in his time. Their manipulators command terrifying sonic power with the ease and subtlety of a breath.
Both will need to be dealt with.