Why do Liches, Necromancers, and Vampires hate each other in TES?

EDIT:

http://www.imperial-library.info/mwbooks/arkay_enemy.shtml

Arkay The Enemy:
- refers to Liches and Vampires as the unbound dead (implication: not being servants created or bound by Necromantic magic, both are immune to summoning and control by Necromancers)
- refers to the possibility of an alliance between Liches, Necromancers, and Vampires

I dunno. It never made sense to me that Liches and Necromancers would be opposing factions. That's such a bizarre decision for Oblivion. Vampires maybe. They're not technically undead in the truest sense of the word, and their feeding on human blood somewhat conflicts with the Necromancers' habit of killing and reanimating corpses as zombies. Some vamps allied themselves with Mannimarco during his initial uprising against Gallerion years ago however.

The Lich thing is a complete mystery. They should be allied with Necromancers. I call game mechanic on that one.

Well, all the necromancers in Oblivion aren't technically necromancers. They are members of the Order of the Worm. It isn't suprising that Mannimarco would instruct his minions to be hostile to other lichs. I mean, competition svcks.

What I don't get is why in the few first TES games, vampires were undead (like you actually died and came back "as a new person") and now it's pretty much just a disease that keeps you out of the sun.

it was always a disease in TES. just in daggerfall, people mistook you as dead and put you in a masoleum where you awake 2 weeks later.

anyways, it makes since that liches and necromancers are at odds. why would liches ever team up with mortals? actually, why would liches even team up with other liches? liches are suppose to be the ultimate selfishness. they want all the power for themselves.

necromancers want dominion over all undead, so there's some headbutting there.

Then why, in Daggerfall when I visit King of Worms in Scourg Barrow, I see him surrounded with loyal liches and vampires? Moreover, the ancient ones.

The necromancers in Oblivion are minions of Mannimarco, A.K.A. Super-Duper Lich Master. I would suppose that the liches surrounding Mannimarco in Daggerfall were allies of his, while the random liches we see in Oblivion are independent. Independent undead are just competition to M., so M. is telling his minions to be aggressive towards them.

I just made all that up, but I like it so I'm believing it.

Mannimarco is the God of Death/Necromancy - but in Daggerfall what you met was likely an Avatar as the Nerevarine was an Avatar of Saint Nerevar

Ordinary/living people in different Provinces have different beliefs, morality, government, customs etc - why woud Liches and Vampires be different? all beings are influenced by their cultures and race plays a part in that

Liches gain their status through a long search for knowledge and to succeed requires great skill and hardship. They earn it. Just as Mannimarco earned his Godhood - he is not just a Liche

It may be that Mannimarco helped many necros become Liches ... and thus made them into his loyal followers and servants - however it may be that some of them are there to learn from him or even steal from him. Although it has to be said that most would have been his supporters in the war with Gallerion.

There are other ways to bind creatures apart from necromancy

Vampires on the other hand require no great skill to become what they are - they just have to be dumb enough to catch a disease - and note that in Morrwind Clans of Vampires fought each other ...

Magica is practiced in different ways in different Provinces too. Only the Mages Guild has attempted to impose any kind of standardisation. So thoase Ancients my be learning from each other too.

It wasn't an avatar : Manimarco was the King of Worms, and through the Warp in the West he became the God of Worms. He couldn't be an avatar of yet-to-come god, at least within the mortal perception of time.

that can be explained by the rules of cool. the king of worm's billboard just wouldn't have been menacing if they had other creatures instead, since the king of worms couldn't attack.

i never understood why so much attention is given to the king of worms, when the underking was much cooler in daggerfall.

That's true, just because some people are undead or associate with undead doesn't mean that they'll all be friends.

The most logical explanation would be that, for one reason or another, the independant liches you see who are hostile to necromancers just have conflicting interests with them, or just hate necromancers, and the same goes for vampires. Of course, Bethesda could have also just forgot to set their factions to be friendly (unless there's some piece of lore I'm neglecting that supports them all being hostile to each other, of course.)

Rephrase: Is there any lore that either supports or contradicts the negative disposition modifiers (-100) that these three factions have for each other in Oblivion?

not really.

What you guys have to remember is that liches, vampires, and necromancers are like people. They all have their own goals as well, not just racial ties.

Vampires hate necromancers because they dont like the fact that they can controll the dead. But some vampires would ally themselves to mannimarco just because of offerings of power.

Liches were originally necromancers at one point or time that "ascended" using dark magic. So they probably are as one person said earlier selfish, and greedy for their power. They wouldn't want necromancers controlling vast armies of the undead when they themselves have the same goal. Now their probably is the odd exception to this rule. Theres a dark brotherhood quest where you have to kill a necromancer who is on the verge of becoming a lich. If you read his diary you find out that he worships mannimarco, and mannimarco himself gave him the knowledge of how to become a lich.

The random liches in Oblivion faile, which is why they are so hostile and weak. I'm not sure why so many amatuer mages tried to turn themselves in Ayleid ruins, but I'm sure that there is a way to cover-up the mistake there as well.