Mario and Luigi - Smoldergeist

Here's a smoldergeist, the purple will-o'-wisp-like creatures that make up the second boss battle in the real world in Mario & Luigi: Dream Team. They only make an appearances in the depths of Pi'illo Castle, where a Smoldergeist puts the Bros. through several tests as they go from room to room. Upon Mario and Luigi's arrival to where Princess Peach and Toadsworth were, they scare away a group of Smoldergeist surrounding them, making them all disappear. Once the Bros. take Prince Dreambert (in pillow form) and a pair of Badges from the statue in the room, the statue causes an earthquake and then summons four Smoldergeist to battle the Bros. as punishment for taking the items.

Smoldergeist (c) Nintendo