Meaning of スパークする in 大暴走した言霊がスパークする I imagine the definition being used is " () " however I am still confused as to what it actually means in this context. **** She says "It's a true name that should be kept secret, that cannot be spoken carelessly" and then says it is of the level that "" from my understanding refers to the spiritual power that is thought to be contained within words. modifies but what means in this context is not clear to me.

in this context is almost synonymous to (). She's saying that uttering that word means almost the same thing as casting an explosion spell, because the word itself has an uncontrollably strong power.