Just keeping this here as a remainder, not sure if this will be implemented.
Split from issue #122 by @EpicCreeperHD:

Some vampire mechanics feel a bit off. Mainly the feeding. People have commented on the current feeding system and would like to see some changes, the first being made to the way that a vampire feeds. Rather than being an instant thing, it should be a slow drain over time. Let's say 5 seconds for a full drain that would kill a villager (and/or possibly turn them). Another suggested idea would be a "blood meter" on the side of the screen that would fill if your health and hunger were both full after feeding. This meter will be drained to heal the player and restore their hunger when lost and should last about 20 minutes from full at all levels before it is completely empty. Higher level vampires should still drain hunger faster, but have a larger blood meter and get more blood from feeding to compensate so that at any level one villager death will suffice (as long as they dont need to fight). Vampire abilities should also drain the blood bar to be used. But this should be a fixed value that only changes if the ability is improved somehow. This means that high-level vampires can use their abilites more in between feeding, but still have to suffer the cooldown whereas low-level vampires can only use it once or twice. This would also be a bit more of an encouragement to take blood bottles with you...

Closing this because I created a duplicate one