Rainbow Jellyfish

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Rainbow Jellyfishes are passive Mobs found in the Shipwrecked DLC. Similar to regular Jellyfishes, they float around in the Ocean, sometimes in groups. They will not attack the player or flee if they are approached. They will not shock the player on contact as regular Jellyfishes do. Once killed, their carcass will float in the water until picked up.

Rainbow Jellyfishes can also be caught alive using a Net or a Trawl Net. As inventory items, they can be murdered by right-clicking them to produce Dead Rainbow Jellyfish. A Rainbow Jellyfish placed on the ground will immediately turn into a Dead Rainbow Jellyfish. They will have a short animation where they twitch twice before settling.

Rainbow Jellyfishes can be cooked to make Cooked Rainbow Jellyfish, while Dead Rainbow Jellyfishes can be dried on a Drying Rack to obtain Dried Jellyfish. Rainbow Jellyfishes cannot be used in the Crock Pot.

Rainbow Jellyfishes take 2 blasts from the Ice Staff to be frozen and 1 Sleep Dart to be put to sleep. They are considered innocent creatures, and killing one adds 1 point to the player's naughtiness level, which can cause Krampus to appear.

Migration
During Full Moon nights, sometimes Rainbow Jellyfish migrations can take place. They will spawn in large groups and travel together towards the Volcano. After the night ends, they will slowly disappear again.

Trivia

 * Rainbow Jellyfishes were added to the Shipwrecked DLC more than a year after its official completion in an unnamed beta update.