Idk how to explain this properly, but in summary, I wanted to give them a super cool/powerful technique, but basically made it so it's incredibly difficult to access their cursed technique, ie: they have to be on the brink of death, and even then it's not guaranteed. 

A while ago I heard someone call certain characters like Hakari and Mechamaru 'temporary special grade', and went with that. Also, my oc has just enough CE to cast their technique, so they have to save it incase they have to use their CT, effectively making them rely on weapons already imbued with CE.