Board Thread:Warhammer 40k General Discussion/@comment-24332685-20140106171610/@comment-217.234.123.97-20150101020441

simple: every legion gene-seed is unique, meaning that  certain markers may be absent or certain  traits reinforced. we cannot say where their resilience comes from ( barbarus homeworld as death world with tons of toxins that people got exposed to. ( the organs store toxins f.e.)) f.e. in case of death guard.

we cannot reqally say what makes them extra resilient.