Oh hey I already figured out a better munchkin strat since PW hamstrung the last one. 0 all stats, 230 heart. This would mean 690 effective stat points redi... wait, no, there's a cap of fifty. Damn.
When performing an action or save, such as attacking, dodging or resisting demonic effects, you can use the bonuses of any part in one limb. You can use the bonus from up to 3 parts for free, but any parts used beyond that requires a bit of risk. Namely, a Heart save equal to 100 + the total bonus gained from the part usage. For example, if you had a 5 part limb that gave you +50 to Strength and you used it to attack, you’d have to succeed on a heart roll with a target number of 150. If you succeed on the roll, your action goes through normally. If not, you lose humanity points equal to the bonus you would have gotten and your action automatically fails. Note: you can NOT use bonuses from parts for the heart roll.
Ohh, this is the part PW was referring to. Doesn't this conflict with the basic idea of the game, increasing stats through demon parts? It requires ridiculously high natural heart to use large nonhuman limbs without risk. For instance, the hulk arm that PW talked about a few pages ago would count as more than three parts, meaning you're basically banned from using it without excessive heart. Even if you can use it, there's little benefit over human limbs beyond it likely being less demonic than them, so you can do multi-limb stacking more easily if you have truly excessive heart.
...Hmm. Actually, you only need 40 modified heart to safely deal with a +50 limb (momentarily ignoring the excessive 100 humanity cost for having a 50% longer leg); You'll take a hit of fifty humanity, but immediately regen 4*15=60 humanity, leaving you completely normal. If you add thirty points and get to 70 humanity, you can spend fifty humanity on buffing a single roll, too. It's a dangerously large temporary drop if you're taking humanity damage from other sources, but under normal circumstances it's perfectly fine. Basically, this is just a way to more efficiently pump humanity points into a stat; it's uncapped, applies to all rolls, and is 1-to-1 rather than 2-to-1. And sometimes has no cost. The primary penalty is that you can't necessarily
stop spending humanity on the buff, and even that is ambiguous, by on PW's wording.