Truth be told Darko is evil because of the light gods specially the creator. Darko was shunned by his ability. Because of him taking life away. And none know darkos mind. Not even his secrets he could think one thing but do another. Him bringing the dead back to life was 100 years aer the clash started. He is truly a dark god. His mind is in chaos that's why none know his secrets because he has none. Not even a fear. He is death and fear grey. Not just death. He does not care for secrets