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Slayer: I Will Eradicate All Monsters

The entire world was peaceful until one day, a crack in the sky brought upon the end of peace. From its dark chasm, monsters from the otherworld poured out.
These monsters had one singular goal: Destroy the world.
Treating the inhabitants like livestock, these powerful invaders killed and massacred as they went.
Damien, whose parents were from two of the most powerful races - the angel and vampire race - seeks to avenge his slaughtered parents and with the power of the two races and the ability to devour the abilities of creatures he kills,
He will....
ERADICATE ALL MONSTERS!