Astral Dispersion (アストラル・ディスパージョン, Asutoraru Disupājon) is Tatsuya's new magic, which can work against Spirits (Information Bodies). It's a variation of one of his innate magic - Decomposition.
This magic decomposes the structure that supports the Pushion Information Body, not the pushion information body itself. [1]
By destroying the structure of the psion information body which helps the spiritual body (pushion information body) to exist in this world, the targeted spiritual body is expelled from this world.[1]