Reborn Of a Vampire Dragon
said Abyss.
Chaos ignored his servants for a few seconds as he was receiving a sudden infusion of life energy from the dragon he killed as if it were EXP in an RPG game, any time someone slew another being in this world, their existence rank would receive a little boost, getting them closer (by a little bit) to the next stage or realm, although this obviously varied, the bigger, stronger, and ferocious the killed being, the more essence could be acquired from it after killing it. And just like games, if many defeated a single entity, the essence would be shared around.