Slayer Sabres

Monster model only. Select one of the bearer's melee weapons. That weapon gains the following ability:

Slayer Sabres: Each time the bearer fights, after that fight is resolved, select one enemy unit hit by one or more attacks made with this weapon this phase, then roll one D6: on a 2+, that unit suffers D3 mortal wounds, or D6+1 mortal wounds instead if that unit has the Psyker keyword.