Blood Tithe Points

Blood Tithe Point mechanic reveal for the World Eaters.

via WarCom

https://www.warhammer-community.com/2023/01/30/blood-tithe-points-power-up-your-world-eaters-whether-theyre-killing-or-being-killed/

This new army ability rewards World Eaters warbands for every drop of blood spilled in Khorne’s name, whether it belongs to them or their enemies. So long as warriors are shuffling off the mortal coil, the Blood God is content, and his bounty of Blood Tithe Points (BTP) can be spent powering up your remaining units.