From the Super Mario Wiki
Yellow Magiblots are magic stain creatures that appear in Super Paper Mario. They only appear in Castle Bleck and the Flipside Pit of 100 Trials. They are a balance between the Red and Blue Magiblots. They wait, hidden in the ground, for potential prey to approach. Then, they rise out of the floor, only long enough to shoot magic blobs. They sink back into the floor, then repeat their attack. They are commonly found with other Magiblots. But they have average HP and Attack.
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