1) Tritium (TRIT) - liquid, change volume like that deuterium, red color, when contact with neutrons make rapid neutrons, electrons, photons and plsm (all with 9725 C ), generated pressure is 2x bigger than deut, can be setted by console ( !set life......., !set tmp ..........)
2)neutron reflector (NRCT) when is neutrons inside, this can be reflected, every reflect duplicate neutrons, pressure and tempature, when is tempature and pressure max reflector will crash and make BNRC (broken neutron reflector) it duplicate neutrons like that BCLN
Tritium sounds very interesting, could obliterate the DEUT/NEUT nukes we already have. Not sure what NRCT could be used for, but I'm sure you have reasons just like I have reasons for the elements I suggested. Uses are nice too as I've been told, and I see why now, being on the receiving end of the suggestions.
Edit this post with some uses and people will take it more seriously! (:
TRIT has already been modded (can't remember who though). Infact, it's better than described here, because it is coded to fuse with DEUT in a fusion explosion, which involved beams of NEUT being sent out. Very cool.