These units are unusually resilient; they often remain functional in spite of damage that would cripple most war engines.
Where your unit has the Biosave ability:
When the unit suffers critical damage, from any source, roll a D6: On a roll of 4+, ignore the critical damage — that is, do not roll on the Critical Damage Table.
1. Difference from Epic 40,000: We created this ability for Epic Remastered — there is no equivalent in Epic 40,000.