Artifact chaotic helm Helm of the Underworld, modeled after Hades’ helm. Grants drain resistance, invisibility, magic resistance, and passive detection of buried objects (or phasing, if this is too difficult to implement) when worn. When invoked, it does a stronger version of the chaotic turn undead effect (rebuke or tame undead).

You can get some rare intrinsics by eating artifacts that confer them. For instance, eating Excalibur could give level-drain resistance, or eating Grayswandir could give hallucination resistance.

The chance would be much less than 100%, possibly even lower than the standard odds of getting an intrinsic from eating jewelry.

A race which is very strong, with great abilities and intrinsics including drain resistance from XL1, but with the caveat that they instantly die of old age upon reaching XL30.

Intended for variants whose XP curve doesn’t make reaching experience level 30 through pure combat nearly impossible. Also, a safeguard might have to be put in place so that you cannot intentionally get smited by a god or gamble on polymorphing into your own race to lose levels intentionally.

The ring of sustain ability also confers level drain resistance.

Amulet of drain resistance, which also gives immunity to death magic. Useful if monsters casting drain life are implemented.