Xenophilic Mind Control Faction

Gains POP by stealing it from other factions. Perhaps by having troops in the region, determined by army strength.

Many of us have seen mind leech, psionic, or other such races that enslave others through mind control. I'd like this faction work either through pumping endorphins in to the host to create a chemical dependency personally, but whatever works. Aesthetically, I'd like it to be some sort of eldritch abomination with tentacles, but having that sort of feel mechanically is more important.