Tenebris

Tenebris, the Shadow Bellow is the Elemental Lord of darkness, his form is that of the shadow of Lummen, the Elemental Lord of Light.

Tenebris absorbs the excess light and energy produced by Lummen in order for it to not interfere with the environment they are in.

Powers
Tenebris is immortal and has a powerful connection to the Cor granting him a great amount of magical power.

His true power is to absorb all, including light, it is possible that Tenebris is the most powerful of all Elemental Lords as he seems capable of absorbing all magic used against him.