Need help! Blood Tome

I see this was posted awhile ago, and maybe you and your DM have already decided on something. Nevertheless, to offer some ideas that might not have occurred to either of you... Note that I'm not deeply familiar with Pathfinder and have never even heard of Deadman Wonderland, so whether any of this is appropriate for your character, I don't know. A lot of it also depends on how generous your DM is. I have no idea what sort of items he's allowing for other players, so it's difficult to know what's balanced. As the item grows in power, you and your DM might consider giving the conversions described below a more favorable ratio.

Offensive:

1) Blood Attack - Treat as the power attack feat, where you can trade a penalty to attack for a bonus to damage, except you trade HPs for bonus to damage. I would probably do a 1:2 conversion (every HP you spend increases damage of next attack by 2)
2) Seeing Red - Select a target, which must make a constitution (or maybe wisdom) saving throw. The target effectively has the blinded condition for any action that does not include your character as a target.


Utility:

1) Blood Sense - You can concentrate on the item to detect all living creatures (no undead, constructs, elementals, etc.) within a distance of X (again, negotiate with DM to determine range and frequency of use)
2) Transfusion - You can move HPs from one character to another including yourself, at a 2:1 (donor:donee) rate. Both the donor and donee must be willing.

Defense:

1) Blood Drinker - Once per X (negotiate with your DM on frequency of use) when you hit with an attack, you gain half the damage as HPs.
2) Blood Rage - You sacrifice HPs to gain a bonus to any saving throw against a magical effect that causes fear or charm.