Divers often find themselves terrified when they encounter a shark underwater, but the Pursuit Jelly is a far more dangerous creature to encounter. A subspecies of Jellys, it locks it's eyes on the target and follows it relentlessly until it can attach itself where the brain is. It then injects itself into the brain to take over and lives it life in control of the creature it is inside. In cases they have taken over humans, they eventually learn languages and social cues to fit into society, but at poor level of eloquence.