Thread:FixSRwiki/@comment-46261745-20201002230402/@comment-46261745-20201018195222

Actually, it effectively reduces the attacker's INT by exactly 1, or 0.5 in the case of demon mages.

It's just when you're tring to figure out how it works wiht the Defender's effective INT that it gets into fractions because Magic defence = INT * 7