Nothing. (Because unless it was deliberately enabled by the developers which is highly unlikely given eso is a MMO RPG, it would technically violate the terms of service to some extent.)
In another multi-theoretical universe where it is deliberately enabled, I’d probably settle for the Undead Mod from ESO V: Skyrim where one can actually become a Lich.
If you see me anywhere. Know that I am sitting back with a bag of popcorn, watching as ESO burns the goodwill of its player base with practices that only disrespects the players time like it did to me and many others...
If a game does not respect your time, best thing to do is move on from it and find something else.
1. Marry NPCs
2. Use a Alt as a combat Follower for Overland content
3. Use all of my Alts as housing furniture, they don't have to move around just sit, stand, or be in whatever personality I set them as in-game.
i would completely remove ALL of the classes, characters, and ALL the dialog as well as anything related to current day.
i would trhen create a copy paste of everything that is in morrowind SP that is characters and voices and then make the game classless and allow to chose a major skills minor skills and everything that morrowind has and start from there and completely rebuild slowly untill the pvp is normal and good and the quests and everything is the same as morrowind.
there would be Zero shield stacking
there would be Awesomeness everywhere, sales would go up and the crown store would be removed as well.
New skill line - Spellsword, with all skills having a Magicka and a Stamina morph.
New skill line - Spellcaster, with dual wielded spells, without a weapon.
New weapon - bound weapon, a Magical counterpart for all melee weapons and the bow.
CBBE + Body slide.
Followers.
Adoptable children.
Mod in all the missing awesome furniture items.
Change the looks and layout of the houses.
Make more houses available.
Make all houses available for gold.
And about a million things more, probably making me crash the game on the loading screen.
Easy I would morph my Breton racial passives to stam or pick them. I would do it in a way that is balance even if it’s having identical passives to nord for example.