Once again using the example from here and forge 1.19.2, it doesn't crash anymore but twiddling with the values it also doesn't seem to do anything at all, the damage stays constant at its vanilla value.

I'm also not sure what its supposed to do, is it just a shorthand for modifying the damage but with filtering for the user's enchantment or does it actually mixin the damage modifier formula for sharpness/bane of arthropods/smite/...?

On Forge, it modifies the damage through an event.

base_value is the damage at level 1. With any more levels, the modifier is applied as many times as more levels there are.

Thank you for the report though, I should really stop assuming things work after one fix.

I was accidentally setting the power to equal the modify enchantment damage taken amount, which would be 0 without any of those powers.

This has now been fixed.

Fixed in v2.1.0