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Boney Paw

brittle bones but active and no upside, I love it

rattle me bones

Oddly OP

I do see that you've just updated it, though. You certainly work quickly! I hope that this kind of balance suits you. Again, I do like the idea a lot.

My only real gripe with the idea is that, while it doesn't give you the same ability to regain health as red heart containers, it gives you larger potential and survivability than soul hearts with Guppy's Paw because red hearts are still useful to you.
If I may make an interesting note, you could always reverse the effects of Guppy's Paw and create a full bone heart out of three soul / black hearts?
I do want to preface that this is, of course, a mod made at your discretion, not necessarily something that has to be perfectly balanced to match with the rest of the game.
You have a nice thematic, a good idea, making use of how a couple of existing items in the game work and creating something out of it.

If you have the idea in mind to create something that you want to create, then you make it exactly how you want it to be. Balance this however you want to, because it's yours to mess around with, y'know?

Looking at this item, you basically double your health for every heart container that you have and get the additional bone protection. Personally speaking, the item still seems excessively good. A one-for-one trade would be more ideal, and even still there is no actual drawback to using it.
Using Guppy's Paw is a gamble because you trade one permanent heart container for three finite soul hearts. Good short term, bad long term.
With this item, there is zero excuse not to use it immediately and as frequently as possible.

Just providing a little criticism. It's a very nice idea, I just think you may have picked a difficult thing to balance.

2 empty bone hearts sounds a bit more balanced, cool mod tho

idea can you change to tammy's paw

Nice mod!