In an ordinary X-ray crystallography experiment, a beam of X-rays is shot at a crystal and produces a lovely pattern of dots, which can be deciphered to determine the location of every atom in the unit cell of the crystal.
You have developed the ability to release X-rays approaching a crystalline object from all directions. Tracking backward along the precise path by which they would normally be emitted in a crystallography experiment, with the appropriate phases (which we don't capture in a classical photo like this one), these rays regenerate a single X-ray beam on impact.
But --- you do this for X-rays moving in directly opposite directions and also with directly opposite phases. The combination of photons produced concentrates a large amount of energy moving in one axis of the crystal, but the photons then cancel each other out (destructive interference)! The energy they contained is transmitted to the unit cell structure of the crystal, giving it the precise vibration that you intended. When this process is repeated to generate wave trains and other high level patterns, the net effect is that the crystal can expand or contract in one direction, which can allow it to push off from a surface or shatter completely.
The chaos of liquids, solids, glasses and other amorphous structures prevents you from calculating the precise pattern of X-rays needed to generate these localized effects. Fortunately, X-rays have a very short wavelength, so objects made of imperfect tiny crystals are still easy for you to manipulate, by bombarding each individual crystal with its own well-calculated set of X-rays.
The X-ray energy involved is of course quite lethal, helping when necessary to persuade your recalcitrant subjects toward greater patriotic fervor on your behalf.
Postscript: But how do you produce the X-rays in the first place? Well, this is perhaps something best not mentioned. Becoming a Reality Warper involves some sort of ritual or pilgrimage. You stood at a spot at a special moment of invocation. At that spot, unknown to you, was anchored a Dark Matter Dreadnought, a vast machine invisible and intangible to our eyes that had been matching its speed and position to a spot on the surface of the Earth for hundreds of thousands of years. In that moment it used an exotic matter bridge to penetrate into many sites of your bones and nervous system, giving it constant awareness of your thoughts and making it work as one with your body. Still invisible to all eyes, it now reinforces your flesh, guarding it from harm, moves with you, using unknown, unseen physics and machines to calculate your will and to generate the X-rays. The bargain is simple enough: those that have moved their minds into the Dreadnoughts, whose universe of dark matter has almost entirely vaporized into a burning plasma that only a few relict machines can withstand, are seeking a new mode of existence. They need to spy on a human, see what a human would do with access to great power, understand the thought processes by which they operate. When they have learned enough, they will find a way to upload their personalities into human bodies. Most likely starting with yours.