Rod of Detonation

Hey everyone, first post here.

I'm doing laby run in merciless, found a drop:

Rod of Detonation
The next font you hit will be killed instantly
"What can be build, can be destroyed"

Can't find anything online, and I don't really get it; the next "font"?

Thanks in advance

I'm ASSUMING, it's talking about the power-up fonts that the boss of the labrynth gets. I could be wrong though.