Any of the Primarchs from the various Space Marine Chapters in Warhammer 40k, They are soldiers, very high rank soldiers, but soldiers all the same. They are a step above even Master Chief, created from scratch by the Emperor of Man, equipped with the best armor and weaponry, with a legion of Ten Thousand Space Marines behind them.
At least one of them has personally faced down an Eldar Avatar of Khaine, which is one of the Eldar gods brought into reality, Primarch Horus, faced down an Ork Warboss at the height of a Waaagh! which is when a warboss has his most power due to their, mystical.. "Power", which seems to allow orks to do things normally impossible, like make any of their equipment work.