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.

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          Alex R