Minecraft Version
1.20.1

Mod Version
1.51.0-1.20.1 forge (47.1.3)

Describe the bug
Omen effect (using the watcher sword) sometimes instakills enemies and bosses when they're way above the set threshold (0.25)

To Reproduce
As the effect procs randomly, just try it until it happens.
I've noticed it instakill a warden at 480/500 health, and the empress of light from Stellarity at 97% health

Additional Info
Looks like some logic issues here: https://github.com/Sweenus/SimplySwords/blob/1de3ba5839ee527f6652250a08e198507898003e/common/src/main/java/net/sweenus/simplyswords/item/custom/WatcherSwordItem.java#L66C85-L66C85

Thank you for the report!
This should be fixed in the latest version (1.51.5).