Greets. I am including blood charms from the Earthdawn setting in my campaign. When equipped, these items reduce the maximum health of the character by a set amount. Thus instead of attunement slots, these items cost health. To reflect this on the character, I am adding the modifier Bonus > Hit Points > -X (where X is the health the blood charm costs) to each magic item blood charm. So if the blood charm costs 5 hit points to equip, I expect to see "Bonus > Hit Points > -5" reduce the character's maximum hit points by 5. However, no matter what is entered into the fixed field, positive or negative, the hit points never change. Is this modifier not working? Am I using it wrong? Is there a way to accomplish this effect without having the player modify the max hit point field on the sheet (which resets on a long rest and often gets forgotten)?

The “Modifier: Bonus—>Subtype: Hit Points” doesn’t work.

That's disappointing. Any chance there is a fix coming out to activate it? Thank you for the fast reply.

Who knows? But even if it does it won’t do what you want, it’s for stuff like potions of healing.