This mod lets you configure the health of Phantoms. In vanilla Minecraft, Phantoms have 20 HP—just like the player—which, in my opinion, is way too tanky for such an annoying mob. This mod reduces their health to just 1 HP by default, making them killable with a single punch. But if you want to, you can change their hp to whatever you like. For example, setting their HP to 10 means they'll only be one-tapped by a Sharpness V diamond sword.