You could also make use of the jussive subjunctive, though this would be more of a "Let Death take you all!" That would look something akin to "Mors vos râpîât!" You could also have this be more of an invocation to Death along the lines of "Death, take my foes!" with "Hostês mê râpê, Mors!"
My translation may not be spot-on, as my Latin as also a little rusty.
-Tiberius
[Edit: I included the short vowel markers where appropriate, at least according to how I would pronounce it. ]
[Edit 2: Adjectives agree with nouns in gender, case, and number.]