Imagination Realization. As the name suggests, it is the ability to manifest anything you can imagine.
It is the ability possessed by elementals, which are the sense of touch of the natural world. By connecting their will directly to the world, they are able to transfigure the world into whatever environment they imagine. Of course, the level of manifestation varies depending on the scale of the elemental, and it goes without saying that only nature can be transfigured – things that exist independently of nature are immune.

Tsukihime Dokuhon PlusPeriod - TSUKIHIME Dictionary: Marble Phantasm