I remember it, but my idea is more like mixing Ravenloft, WoD and Kult: Lost Divinity. I notice d20 and Storytelling are very different systems, but I like the challenge. Mixing the fluff isn't so difficult, and at least it's fun. The crunch is harder, with new game mechanics about hunger and points of blood. I have thought about something like levels of health, a pool of subzero hit points. The Con penalty by life-drains power would be replaced with losing levels of health, harder and slower to be healed. If you lose more level of health then to be under 0 hit points is more dangerous. The classic hitpoints would be like the "shield" in fortnite, and health the "green pool". Do you know the rule of Stamina points from Starfinder? To avoid abuse by munchkins the vampire would need time to digest the blood. Some special rituals and divine blessing would allow a almost-healing, to become a daywalker Thin-blood, weaker vampire powers, but also a softer curse. The blood potency would be like an ability score, but older lord vampires would enjoy category ages as the dragons.
The points of gnosis and rage by the garou wouldn't be automatic, only after a long rest, but it had to be something like gathering, like buying, crafting or finding potions. This wouldn't break the balance of power.
The areté by the awakened mages would be like crafting a single-using magic item, and suffering a punishment like a rogue when fails trying to use magic scrolls. The Backlash would work like points to buy a magic-item to be used by enemies, or to craft magical traps, for example a rune to summon monsters. Do you remember the psychic enervation by the psionic wilder class? Now let's imagine more exotic effects.
The faes would use thorns-glamour like opposite abilities scores. Thorns would cause penalty to glamour effects, but also a bonus to save throw against hostile chimeric arts. Lycians, special chimeras, would be like a mixture of magic item and ally character.
Wraiths as allies are a double edge sword, because they are too fabulous spies, but their shadows can cause a lot of troubles to alives, for example causing noises to awakening up sleeping enemies in a camp, or giving special magic resistance to a boss monster, or controlling animals to poison food. Do you know the videogame "Painkiller"?
The background of the demons would change, closer to the concept of "vestiges" (pact magic) walking among the mortals.
The reborns (mummies) would be deathless, undead healed by positive energy and hurt by necrotic damage. They know if they kill some enemy they could find him in the other neighborhood.
The power of the imbued hunters would be like spending a single-use magic item. You can't use it and you have to get a new one.
