He reached into his system storage and pulled out Permafrost's core.
The Enraged Nightmare-rank crystal pulsed with malevolent energy, frost spreading across Jack's palm where he held it. He tossed it toward Corvin.
"Eat," Jack commanded.
Corvin caught the core mid-air, his beak crushing through the crystalline surface.
Dark energy exploded from the broken core, flowing into the raven's body like smoke.
Corvin's form shuddered, his feathers standing on end as the Nightmare-rank essence integrated into his being.
[Corvin Evolution Progress: 50%]
Jack nodded, then pulled out the two earth Nightmare cores from Gravok and Terrak. He tossed them one after another, and Corvin devoured both without hesitation. More energy flooded into the raven, his body growing slightly larger with each core consumed.
[Corvin Evolution Progress: 70%]
