Early on, I thought of photon torpedoes as rather like ball lightning. That they were drawn towards other ships without needing any guidance at all. By layering fields of different energies, you could give them different properties with no moving parts.
Here you have a new kind of magnetism
Here you have motion control with a laser.
So you have a wrapped form of energy, or perhaps anti-matter. This becomes entangled like a large romulan plasma torpedo in another ships field after a safe time has elapsed.
it is emitted from the lower dome and perhaps rides an invisible beam if need be.
An all energy TOW missile.