Pretty powerful, and it doesn't really prevent people from stealing your stuff. Yet.. but yeah basically manipulation/control over things that are related to yourself. Basically personal configuration to an extent, probably.

@SleepyTact I mean it does have theft nullification...Keepsie which solipsistic Manipulation came from...people would try to steal from her and become petrified till she Freed them

Hmm fair enough, the power is knowledge based propety or smth. As long you have experienced and understand it, you can manipulate it to an extent. Including people's possesions as a medium to control them probably