I know half-elf stats suck. It's not my choice, and the player who will run Jagged has been playing this character in different games/systems/campaigns as a half-elf (when possible) or the nearest approximation (when not possible) that has a melee combat focus.
The feat doens't give the [cold] subtype, however it allows you to pick one of four [fiend] subtypes, all of which give immunity to 2 types of attacks (one type of energy and poisons).
I'd suggest either Yugoloth or Demodand and give her [Immunity: Cold and Poison].
She prefered Yugoloth (fiendish mercenaries?). Which makes sense. In her original setting 1/2 elves are the equivalent of Uruk-Hai, shocktroops, but also good looking enough to be considered brothel chattel.
In that setting "everyone knows" that 1/2 elves have no value, so treating them as soldiers or brothel workers worked in that setting.
Personally, I don't like that fact about the campaign that the character came from (on several levels), but w/e, that's the character's history.
However, I know that [Yugoloth] doesn't give cold immunity.
According to MM2, the [Yugoloth] subtype gives acid and poison, as well as Energy Resistance 20 versus Cold, Electricity and Fire (which is
pre 3.5, so 10 or "scales to your levels" makes more sense as well as 100 feet of Telepathy.
and I don't have Fiend Folio, so I can't check Demodands out.
We could just do the following; since you'll probably never use Yugoloths, and since it really doesn't matter in the long run
Parents with style
Tanar’ri
Ahhhhhhhhhhhhhhhhhh!
Ropiningingi Oni!, or "Demons are worse lovers than males."
...people with actual Demon parents are... usually not wanted.
Baatezu
"This contract says that you'll give birth to a great and powerful child, and that I will make sure that the birth won't cause you any undue harm."
"Is there a favorite position that you have? Gutting you by mistake would be unforgivable."
Contracts and Consent, or getting the most out of your Devil baby-daddy or Devil baby-mama
...if you're clever, or just serve devils, they may help give you fiendish offspring. Truth be told, a Kyton baby-mama would be better than other options, mostly b/c they can go adventuring with you and kick ass, and honestly, couples that go around killing shit is awesome.
Yugoloth
My services..... come at a price, what do you bid?
Fiendish Mercenaries, or "How I got to know your mother during the war"
Yugoloths are elite fiendish mercenaries that ply their trade across the multiverse, as such, these fiendish soldiers have been nearly
everywhere and met nearly
everyone.
Wherever soldiers travel through or war, populations undergo changes. Be it reduction of population, or sporatic influxes of offspring with non-native parentage.
As a result [Yugoloth] descended offspring tend to be treated with a wider range of opinions compared to those of other fiendish heritage.
Those of [Taana'ri] heritage are usually the products of attacks on mortals, and thus either pitied or scorned. Sometimes both at once.
Those of [Baatezau] heritage are usually the product of an agreement or pact made by both parties to produce a child with both fiendish and mortal characterstics. As a result are viewed either as tools, or pawns, and thus treated coldly, or are viewed as the ultimate blending of Immortal and Mortal creatures, and treated with deferance, awe or affection.
Those of [Yugoloth] heritage are seen the way that the children of soldiers, not long gone, are seen. Usually tinged with the same emotions that occured during conception. Ranging from disgust as the product of an unwanted sexual encounter all the way to nurturing love for the child of Yugoloth trooper that spent time with a mortal.
If should be noted that with Fiends, offspring can result in
non-standard arrangements, and just because a male mortal mates with a female immortal, doesn't mean that the mortal won't have to raise the resulting child. Usually, a few days to a few years later, the mortal opens their door and sees a child in a basket woven out of a ribcage and swaddled with the suede of some infernal creature on their doorstep. Hilarity tends to ensue.
- Immunity to Poison and 1 other Energy Type [chosen from Cold, Fire, Acid, Electricity]
- Energy Resistance equal to Hit Dice versus the three energy types that were not selected in the above immunity
- 100 feet of Telepathy with any creature that has a language
Demodands
"No! You get back here right now!"
Fiendish Wardens or Comic Relief
... Demodands are jailers, but are also jailed themselves. This has happened nearly forever ago, but Demodand's sware that the ones at the bottom of their 3-level racial tiers are the "reason" why the whole species is in Carceri.
Naturally the fact that these fiends live in a prison plane forever makes nearly everyone think in some way of typing up, chains, whips and other related stuff.