NeuTriNO

Neutrino's are particles that pass through EVERYTHING (much like a similar thread post before mine here), but unlike the previously suggested element by that other guy, my suggested NTNO doesn't ALWAYS pass through everything, only MOST of the time. It should be able to pass through everything that's an element, even diamond DMND (as well as blackhole and void and singularity), but should have a probability of a collision at any given moment when it's "inside" a substance of about 1 out of 10000. Collisions would thus be very rare, but when they do occur they'll be damaging, as neutrino's are high energy particles. As with THDR an impact of NTNO should increase the pressure in a given air-cell to its max value, and increase the temperature of the particle it collides with to the maximum possible temperature. If this NTNO got inside a block of metal before collission occuredm it would heat the inside of the metal to well above its melting point. The pressure would make it cause damage to shaterable objects like glass (both breaking and melting it). Of course given the high penetration of this type of radiation particle, it is likely to pass through the material completely, but in the event of a collision it would be devatating to the material. The ONLY thing that should be capable of blocking this absolubely is a wall.

It should (in addition to being directly placed by the user) be able to be generated by fusion reactions (as you know fusion already exists in TPT, and works with HYGN, CO2, and NBLE so far). In fact remember the neutrinos that exist in the world for real are generated in the fusion cores of stars.

It has a use. While in real life the chance it will collide with anything only becomes assured when that object is lightyears in diameter (millions of neutrino's will pass through earth without striking a single atom, because they are so small and have no electric charge).

However this would be dumb to have in TPT. In TPT we can give it a much higher probability of striking something (so you don't have to wait for centuries before you get a collision between a NTNO and another particle), but still make sure that it behaves close to a neutrino. That is it can pass through everything MOST of the time, but at random (approximately 1 in 10000 times) it will interact with the particle it's in contact with.