Not steam explosion; in fact, steam explosionu.
But we're changing from "Eldo" (an actual name, BTW), over to "Eld."
Why?
Because we don't want an extra vowel on words, unless it's fucking dumb! That's why!
[EDIT]
We will, however, accept: "Steam Explosion Uwu;" it's a well known spell, and the more powerful version is "Steam Explosion Ara Ara."