Bio Red Blob

The Bio Red Blob is an inorganic type of monster found on one of the islands of Cal Mira Archipelago.

Overview
They are not powerful monsters as their strength is comparable to that of a Balloon but they provide an incredible amount of experience for the effort. During the activation event (a time where monsters of the archipelago spawn in excessive numbers), they spawn at rates capable of overwhelming experienced adventurers but because they are so weak, they aren't seen as much of a threat. They were mentioned along with a few other apparently weak monsters including Magenta Frogs, Yellow Beetles, and Cactus Worms.

Trivia

 * Despite the 'Bio' prefix, the Bio Red Blob does not appear to be related to the BioPlant at all.
 * A similar monster was mentioned in the Web Novel.