Fog Pillar

The Fog Pillar is the name used to describe the large mass of fog Dagyvinbuaill stays in. It's located in the Grassy Plain originally, but Dagyvin the power to move it. It's completely featureless on the inside, except for one magic door which leads to a Mysterious Room.

Dagyvin seems to have complete control over this area unless he's disoriented, shown after he had one of his own bombs deflected into his own face. He can also move it with him at will.

Unlike normal fog, nothing around them can be seen once inside, apart from that door. Upon entering with someone else, that person tends to disappear until one can find them again. The fog is also seemingly endless, and bigger on the inside than the outside.