A Noble Death

Once per battle, in your Command phase, this model can experience this vision. If it does until the start of your next Command phase, it gains the following ability: 'A Noble Death (Aura): While a friendly Grey Knights Core of Grey Knights Character unit is within 6" of this model, it gains the Objective Secured ability and can Set to Defend. If a model in that unit already has the Objective Secured ability, that model counts as one additional model when determining control of an objective marker.'