[quote=@Lucidnonsense]
Ehhh character concept, slave who somehow gained the mind of a member of a previous race the aliens invaded, Lacks any Caste powers but has increased intelligence and knowledge of certain alien tech (some of it is more advanced than what his species could do, but he knows how a fusion reactor works)
[/quote]

Memory transfer technology does exist and they would have brought slaves with them from other worlds, so maybe it managed to transfer some of its memory to you.