Questions on making a white dragon lich

[Heavenfluff]

So in the game I GM, the party finally managed to slay a Ancient White Dragon that has been giving them trouble. Recently a friend I know made the rather sadistic suggestion that I bring the dragon back for a third round as a lich, but I am debating on both if this is too cruel and if it can be done in the first place

First off, can you make a Ancient white into a lich? It takes a caster level of 11 to make a Phylactry. While the dragon's sorcerer levels are too low, it caster level for it's spell-like abilities is more than high enough.

Second off, I am curious: if the above is possible, would a ancient white dragon lich still be vulnerable to fire? would it still have it's breath weapon? I know one of it's claws would likely be replaced for the touch attack that lichs get. What other things would a dragon lich lose or gain?

[the David]

Have you heard about the Ravener?

Usually though, you become a lich by putting your soul inside a phylactery. That would be something you could only do while you're still alive, so your a little late.
It would make for a great battle, if mr. Dragon would rise as a Ravener directly after the players killed him. That's a 2 stage battle and those are awesome.

[Heavenfluff]

I was not aware this existed, and having this would be very nasty a surprise. Needless to say I like it. Sadly the party's magus was smart and blew the corpse up, so I'd have to find some way that the dragon had a backup in order to return as a lich or ravener. Although, he died in a dungeon that is a necromancy lab for a actual lich. Maybe I could have the lich bring the dragon back somehow.

[Paladin of Baha-who?]

The dragon could have set up a contingency spell with the necessary spells to capture his soul upon his death and bind it to the phylactery, which had previously been completed, prepared, and hidden.

Or the Lich could have prepared the phylactery, and made a contingency scroll for the dragon to use if the dragon wasn't at high enough CL to cast the spell.

Why is the dragon in the lair of a lich, anyway? Is it an ally? Maybe they're friends (or lovers? that would be weird enough that none of the players would see it coming, I bet) and the lich was planning to assist the dragon to achieve lichdom anyway.

[wraithstrike]

Unless the template removes vulnerability to fire it would still have it. Aside from that just apply the template. The dragon should not lose the breath weapon or anything else, unless the template says it is lost.