Most creatures with the Corrupted race have Water as a Civilization and have the "Choten's Mark" appearing on their body. This is due to the creatures being corrupted by The Choten to serve as his army. There are no creatures who have only Corrupted as a race; all Corrupted creatures have at least two races.
Each Corrupted creature's ability also affects itself, so for example, Blitz Commando would have Fast Attack.
For each Corrupted creature you have in your discard pile, tap 1 less mana card to summon this creature. Whenever one of your Corrupted creatures attacks, choose a creature in your discard pile and return it to your hand.
Each time one of your Corrupted creatures would be banished, return it to your hand instead. You tap 2 fewer mana cards to summon Corrupted creatures.
The Corrupted are similar to the Survivors from the original Duel Masters franchise in that both races rely on sharing effects/abilities between creatures though there are significant differences both mechanically and flavor-wise.