Brand of Sacrifice

You gain the following abilities with the Brand of Sacrifice:

• You gain a brand on your body. Its appearance depends on the Demon Lord in which you have been branded to be sacrificed to.
• You gain the ability to use the Divine Sense ability once per day. You can only detect fiends and undead with this.
• You have advantage on attacks against fiends of CR 10 or lower (Demons). 
• You gain advantage on Wisdom (Survival) checks to find or tracks demons.

Those who are meant to be sacrificed for the creation of a Demon Lord are branded with this mark. Branded humans who are fortunate (or unfortunate) enough to survive reside in the Material plane. They must be ready to potentially defend against the creatures of darkness, demons, cultists, and restless souls of the dead who are drew to the Branded. When around a Demon Lord, the brand will shoot blood out in huge gushes, and the pain inflicted will be agonizing. If the evil is too great, it can supposedly kill the Branded.

Adapted from Beolin_II