Just as a suggestion, maybe call "Human sacrifice" of the seeres miasma or disease spreading or so https://en.wikipedia.org/wiki/Miasma_theory This would differentiate it from the tech "sacrificial ritual" and maybe make it clear that its something hostile (towards enemies). But just to state my opinion / thoughts.

Ah yes true, ideally it would also need to point out what classes it affects.

Enemies would be good. I went with Humans to make it clear that it doesn't affect buildings or siege.

"An Offering of Flesh" or something like that. Raw, savage, but still subtler than outright spelling it out.

A sacrifice is more for a draw back. Like I take a heavier Ax which strikes harder in sacrifice of speed and tires out faster. It's true that its been done in the past. In my understanding it would be more called a "gift to the gods" a present. But I also would expect a priest to twist words.