Chaos Knight is a melee character. His primary attribute is strength. The hero is mainly taken in the hard lane on the third position or in the easy lane as a carry. Most effective in the mid and late game.
Chaos Knight is useful both in team fights and solo kills. His Chaos Bolt ability is great for initiation, and Reality Rift allows him to quickly shorten the distance to the target unit and weaken it. This is especially effective against ranged heroes. Thanks to the Chaos Strike passive ability, Chaos Knight can easily stand even the hardest lane. Illusions summoned with Phantasm become another formidable opponent during fights, and with the purchase of Aghanim's Scepter the ability also works on allies, which makes the team fights significantly more effective. Aghanim's Shard upgrades Chaos Bolt and sometimes allows the hero to eliminate a weak opponent without even fighting him.
Chaos Knight hails from a far upstream plane where the fundamental laws of the universe have found sentient expression. He is the physical manifestation of chaos itself. Where rides the Chaos Knight, death soon follows.