Xintun

Xintun was one of two brothers that served The Fallen in his attempt to escape from the dimension he was imprisoned in. He attempted to trick the rogue Makuta Ynot into entering the dimension, so that The Fallen would feed on his power, but failed. Xintun chased Ynot across the universe and finally managed to force him to enter the dimension, but when that happened, Ynot used a mask to transform him into a Hollow. Xintun's brother Xaaron decided that he had no choice but to feed Xintun to his master, so he did so.