Currently, at this moment Erebos is somewhat an Amnesiac. He remains unsure of how much power he has as well as his powers.
In moments of great stress and anger, a skin-tight suit of darkness will appear on him replacing his current attire. With the suit appears an aura of flame-like darkness as well as added speed, strength, and durability to his powerful physique. Other than that he's pretty much a slightly enhanced human weaker than demigods. In worlds with a dense mana quantity, Erebos can easily summon shadows to help aid him in battle as well as use shadow attacks that range from orbs of darkness that work as a form of second sight and double as bombs. Erebos when at full potential can summon a strange magical sword of darkness resembling the gears of a clock also bearing an evil eye wielding exceptional power all on its own. Simply wielding it adds to his magical power, but at a cost of draining his mana. As a final solution, Erebos will eventually combine the blade's power into the suit, granting him even more power, speed, and durability, as well as enhancing his magic attacks, but at the cost of preventing him from summoning shadows and tripling the toll on his body. His biggest downfall is the immense drain on his energy using his true power entails and even that each and every shadow is essentially part of himself so when they receive fatal damage he feels their pain with some backlash to his being.