So, I was thinking about Castle Volkihar vampires in Skyrim earlier today and the vampire/werewolf lines in ESO and though "What if they expanded upon this". I did some thinking and came up with a, which I think is pretty neat, idea.
For true blood vampires, a player that is gifted with the all powerful gift of vampirism can start a quest, once they max out the vampire skill line, that allows them to join a newly formed supreme court of vampires, similar to castle volkihar, with the mother of vampires as the head vampire. After completing a very challenging quest chain that potentially involves 4 man content to pass some parts, the player vampire is gifted with being a true blood vampire and has the ability to turn into a vampire lord and gains a new skill tree specific for true blood vampires, as well as keeping the original vampire tree. If the player, for some odd reason, decides to cure themselves of the gift, if they eventually regain the vampire skill, they would need to do the quest line again to regain the trust of the mother of vampires.
For alpha werewolves, the player does something very similar to the vampire idea posted above where they hit max in the skill, join a werewolf pack, and do a very difficult story line involving heavily on being a werewolf. After they complete the story line, they meet Hircine himself at which point he will imbue the player with an increased version of lycanthropy where instead of being a grey werewolf, the player can turn into a white werewolf that is even bigger and also has access to an Alpha Werewolf skill tree. Just a suggestion for this skill tree, why not have the ultimate for alpha werewolf be the ability to transform into a werewolf, but not requiring them to build ultimate but instead just have a 2-3 minute cooldown or something along those lines.
Hope this suggestion gets read