All the main evil mages turn lich and I wanna know why this is?
Larloch, Szass Tam both creepy undead things, falling to bits, why is lich the go to option? If you don't mind being undead, why not just get bitten by a vampire. By all accounts vampires lords are extremely strong creatures, I doubt they would lose any of the spell casting power they had before, they would still gain the benefit of eternal unlife and would have have the bonus of not being a gross corpse looking thing that is falling to bits.
Yes vamps have that annoying weakness to sunlight, but surely a powerful mage could find a way to counter that, also the hunger factor, but eating a few unwary travelers or an adventurer now and then shouldn't be a problem for a mage willing to become undead in the quest of eternal life/unlife.
Would capturing a genie and wishing for immortality work?
Maybe binding an extremely powerful demon and forcing it to grant your wish?
Are there any other, less rotting corspey options for mages seeking to live/unlive for ever?