In Trek canon, the Vulcan word for a person's essence is "katra"
This is a morphologically acceptable as a Lojban {gismu} and future iterations of the Vulcan language should just be straight-up Lojban
But not like CLL Lojban
Should use xorlo, with selpahi connectives
If CBS needs to hire a writer who can write Lojban for this reason, I will make the sacrifice and take on this lucrative dream-job