Blood Jelly

The Blood Jelly are jellyfish-type enemies that appears in the Hardmode Underground Crimson Underwater. They are similar to regular jellyfish, but have higher damage, defense, and health, and comport with the "bloody" theme of the crimson.

They drop their own unique banner.

They are immune to the Confused debuff.

Trivia

 * The Blood Jelly appears to be a brain with tendrils and look like monsters in the METROID games.