Xerxes

The real name of the evil Druin who calls himself Xerxes is lost to
history. Supposedly thousands of years old, Xerxes is sometimes called
"the Scourge" by his people. Exiled as a criminal millennia ago, he
made his way to the outer parts of the galaxy, and set about making his
own empire. He set himself up as a "god" among the primitive cultures
of several planets, a crime for which the Druin eventually imprisoned
him. His crystal prison could not hold him forever, and eventually
Xerxes escaped, fleeing to the deeps of space.
Xerxes is powerful but a megalomaniac, and he truly believes that he
is on a path to becoming immortal and all-powerful. He has few allies
and cares nothing for the lives of his servants, let alone anyone else.
Sometime in the last few centuries, Xerxes has perfected a psi
technique for tearing the life energy from a creature to power his own
abilities, making him even more dangerous to encounter