Tunelling Warhead

Tunneling Warhead is a weird sort of altertech, using a technology that is barely understood. Noone precisely knows how it works, nor how it was produced. It is, regardless of that, pretty interesting and useful weapon that can cause massive damage to even best armored ships.
Tunneling Warhead seems to be using some sort of spatial manipulation technology, weaponized in a form of annihilating space in the form of a long prism surrounding the warhead (that is annihilated in the process). The prism is at least a thousand kilometre long, which is still little when compared to the range of for example energy warheads, requiring pretty much direct hits.
On the other hand, it can create a three hundred meter wide 'tunnel' going through even the best defended ship. It can shoot THROUGH even Leviathans, at the most devastating cases going from the beak to the rear, in most cases annihilating the ship in the process, making it potentially the most dangerous warhead in existence.