The Lureling, Is a hostile enderling exclusive to the Discontinued Enderling Invaders Mod, a mod that adds Some mobs from Minecraft Dungeons, The Main Ones being the Enderlings.
Lurelings are very interesting you can't look away, no, really you can't look away, the reason being that they produce an intriguing substance called Hypno Juice, which basically just functions the way Glow Squids were supposed to!
Fight this mob or you might face its hypnoness juice.