Here are his attacks and how to avoid/dodge them:
Attack 1: Hyper Roar
Orc Hero will take a big breath and lets out a silent, but huge soundwave, sending any players nearby into the air and dealing damage. To avoid this, just stay far away from him.
Attack 2: Sword Slash
Orc Hero will raise his sword and slashes forward, dealing damage. To avoid this, stay far away or stay behind him
Attack 3: Sword Shockwave
Orc Hero will launch a large ground shockwave forward, which travels quite a distance and dealing damage to players in the way. To dodge this, time yourself and jump over the shockwave when it closes in, or just stay behind him.
Attack 4: Stomp Crush
Orc Hero will jump up in the air and lands on the spot with a massive stomp, dealing damage to players below him. To avoid this, just stay away from him.
Attack 5: Shield Bash
Orc Hero will hold out his shield and charges forward, towards the players. Impacts when the shield hits the players, dealing damage. This is usually done twice in a row. To dodge this, time yourself and jump over him when he closes in.