Buy RS3 Green blubber jellyfish
The green blubber jellyfish is a members-only food item in RuneScape 3. It is a fish that comes from the Deep Sea Fishing Hub, which players can reach by talking to Goomah in the Fishing Guild. Catching one takes level 68 Fishing, and cooking the raw version takes level 72 Cooking.
This jellyfish is a strong healing food. Players eat it in 3 bites, and each bite heals 500 life points. That means one jellyfish heals 1500 life points in total. Eating it does not lower adrenaline, which makes it great for combat. Expensive spices add 50 more healing per bite, and the necklace of gluttony adds 100 more per bite.
Partially eaten jellyfish can be combined by the clan representative at War's Retreat, Granny Rowan at Fort Forinthry, or Jellyfish Mender Judd at the Deep Sea Fishing Hub. Combining them by hand does not work.
Cooking one gives 165 Cooking experience. Without cooking gauntlets, they never stop burning. With cooking gauntlets, they stop burning at level 90, or at level 99 with the cooking cape. The jellyfish weighs 0.35 kg and can be disassembled for parts.