Awakened demilich save DCs

[Ashenfall]

If I had an awakened demilich, who's base caster was (in life) a 20th level sorcerer, with a 30 Cha, what would the save DC be for his Devour Soul?

I'm figuring he'd be a CR 25 creature (lich CR 22 + CR 3 for awakened demilich), and that his devour soul save DC would be 32 (base (10) plus half hit dice (10) plus Cha mod (10) plus ability focus (2)).

Am I figuring that correctly?

[Are]

Yes, that's right.

[Khashir El'eth]

Ashenfall wrote:

If I had an awakened demilich, who's base caster was (in life) a 20th level sorcerer, with a 30 Cha, what would the save DC be for his Devour Soul?

I'm figuring he'd be a CR 25 creature (lich CR 22 + CR 3 for awakened demilich), and that his devour soul save DC would be 32 (base (10) plus half hit dice (10) plus Cha mod (10) plus ability focus (2)).

Am I figuring that correctly?

I'm usually wary of necroing a thread, but is that a fair encounter? Devour Soul, even with DC1, is really powerful (2 negative levels, no SR, save, or spell turning). Plus, liches are intelligent: target the divine-looking character (aka, healer), and is TPK.

Minus 2 caster levels is obv. huge, and minus your party healer... well.

Maybe I'm missing something, but how would you expect the party to handle that?