[Haskell-beginners] Lujvo forming with cmavo rafsi

Specifically, I want to form a lujvo meaning "omnicide" (to ta'o this is due to the tvtropes trope "Omnicidal Maniac" ta'onai toi). {ro zei catra} or {rolcatra} seems to be wrong. {ro zei se catra} seems like it's all the victims, so maybe selrolselcatra? I'm not quite clear on what it means to be a lujvo if you don't have a tanru as the basis. -- Alex R