Blood Tithe
Each time a BLOOD LEGIONS or WORLD EATERS unit from your army destroys an enemy unit, roll one D6: on a 3+ you gain 1 Blood Tithe point. At the start of the Command phase you can spend points to activate an ability FOR THE REST OF THE BATTLE: Enraged Abjuration (2 BTP, Feel No Pain 5+ against Psychic Attacks and mortal wounds), Daemonic Rage (3 BTP, [lance] on BLOOD LEGIONS melee weapons), Boon of Blood (4 BTP, a 4+ invulnerable save for BLOOD LEGIONS units) and Might of Khorne (5 BTP, BLOOD LEGIONS units gain Blessings of Khorne). They last until the end of the battle, so this is a ramp, not a per-turn resource.