Satrix is a Rift Guardian based off of the Writhing Deceiver enemies in Act II. Unlike a normal Writhing Deceiver Satrix cannot turn invisible.
Satrix spawns tornadoes that travel around the battlefield a.l.a. the Zoltun Kulle boss fight. Beginning at roughly 66% hitpoints he also summons groups of Winged Larvae every 5 seconds or so. Beginning at roughly 50% he begins summoning groups of Snakechilds in edition to groups of Winged Larvae.