'Ghost tricks' are powers of the dead. On very rare, specific occasions, someone who dies will gain special powers - Yomiel is one of these people. Most of these powers manifest in the possession of "cores" of objects and beings.
Of known ghost tricks, Yomiel has the following:
☑ Possession/manipulation of objects
☑ Possession/manipulation of living beings
☑ Possession/manipulation of corpses
☐ Time travel (Four minutes before death!)
☐ Object swapping
☐ Travel over phone lines
☑ Manipulation of multiple cores at once
He also has a core-jumping range of at least (and likely more than) 2.5 meters, and his manipulation is relatively strong.