The Makhai (or Machae) are the gods or spirits (daimones) of battle and combat. They have two upper bodies attached by the backs, and two heads.
The Makhai's weapons of choice are four short blade swords, two in each hand, which they use by spinning and changing the side they are facing constantly in battle, as observed in the Wrath of the Titans trailer. They were seen in the trailer attacking Greek Soldiers.
Their skin has a charred and corroded look, and their faces look slightly deformed. There are lines of lava on the Makhai's skin. Both of the heads wear a helemet, but the head on the right wears a helmet with a plume, and is less muscular than the left head. The Makhai's skin seems to be made of volcanic rock, and as the Titans were primal giants, in the movie they may fall under this label. The right upper body wears a loincloth, while the left upper body wears proper leg armor.
They seem to be powerful in battle, as in the trailer they were seen killing a whole army of Greek Soldiers.
They seem to work for Kronos and have escaped from Tartarus with him.
The Makhai.