The Amber Rose

Drinking angel blood is not recommended. Drinking anyone's blood is frowned upon, but licking bleeding angels is probably going to get you in trouble with someone.
The blood of St Ives is different however, as it is blessed by Thyr, and is actually intended for consumption, rather than its normal job of hauling oxygen around the body. It's more symbolically blood, and the fact that it looks like liquid gold, and smells like towels fresh out of the dryer is another hint.
It doesn't taste like anything much, which is something of a disappointment. Since it is essentially positive energy, it does remove all your negative levels, and restores and mutations picked up from being ressurected.
It also has some different effects for each drinker
* Agamemnon: The blood elevates you, bringing your mortal form closer to your god. You gain +1 Inherent bonus to your Dexterity score.
* Dain: The blood restores an old wound from when you were young, granting you a +1 Inherent bonus to your Constitution score.
* Laniss: The blood doesn't heal you at all, but you do spend a minute in a trance as your mind is expanded in a planar direction. You gain a +1 Inherent bonus to your Intelligence score.
* Mort: The blood repairs some of your less visible damage, and enhances the body Pharasma gave you, granting you a +1 Inherent bonus to your Constitution score.
* Shades: Like Mort, your divinely given form has been augmented. You did not ask for this. You gain a +1 Inherent bonus to your Constitution score.
* Snooks: The blood elevates you closer to god (and further away from dwarves), and grants you a +1 Inherent bonus to your Charisma score.
This is the same as the effect from a Wish spell