Custom Blood Magic: Ritual

By harnessing the power of one of the greatest enemies to Kindred, a thaumaturge may create a stone that stores additional will. Semi-precious stones are popular (especially bloodstone or onyx), but high-status thaumaturges may use gilded rubies and the like.

System: The thaumaturge must first find a suitable stone as a carrier. The stone must be made of natural earthen materials. Glass or plastic will not hold the magic. The caster then must use 4 points of their own blood and place this in an open ritual bowl, along with the stone. An incantation is spoken for an hour, and then the blood is left out in the sun while the vampire sleeps. Each night the caster must retrieve the bowl, strain out any impurities, and take another hour to do the incantation. This step is repeated until a week has passed. After the seventh day, the caster finds the bowl magically empty save for the imbued stone. If the ritual is interrupted, such as the caster forgetting for a day, or someone stealing the bowl, the ritual fails and the caster must start again. The stone must also get 4 hours of sunlight during the day. Overcast conditions do not affect the stone, but magical darkness, prolonged eclipses, or other phenomena may disrupt the ritual at ST discretion.

This creates the following item, found on pg 194 of the 2nd Ed Vampire Players Guide:
Blood Magic Item: Inner Stone
An Inner Stone is usually no bigger than a pebble, and a vampire must swallow it to activate its powers. It provides a character with two extra Willpower points, usable for all purposes. If the character spends this Willpower, however, she will have to recharge the stone by removing it from her stomach and then leaving it in the sunlight for a week. If the character does not spend this Willpower, then she has the extra points for as long as the stone remains in her stomach.