[@Raineh Daze]
I don't have any plan for who murdered Kotetsu (and frankly there's a number of characters in this RP who'd make good culprits), and I left the details of the murder vague because of that. If anyone has a ideas, I'm open. The weapon that Kotetsu and Tetsuo were working on was a mana-powered exoskeleton, but neither of them had all of the parts to complete it on their own. If this idea doesn't fit with the setting or would be overpowered, I could make it something else or just say that it proved to be impossible to build in the end.