I'll agree with the change for the Hanim text, adn I don't think we need to make it more generic. But I don't think it would be too hard to rephrase the gift section if we are worried about WotC IP.
It wasn't the IP issue I was worrying about but that when a random person reads the monster entry they likely won't know who the Hanim are and think "What's a hanim? I can't find them in any monster lists!"
Explaining they're humans makes it a lot clearer.
Updating
Valgoss Working Draft.
For the host, CR+0 and LA+0 seem appropriate, I think. The advantages are not big, and there are compensating disadvantages. I guess I could be persuaded of CR+0 and LA+1 or something.
I was instinctively going to suggest the LA +1 version to discourage mini-maxing but having only one of the Gifts work outside Maelost means it isn't worth bothering with. It's like the special equipment drow have that evaporate outside the Underdark - "just for the adventure items".
I could see a character with multiple worms being a higher CR. The Slaiyith's gifts are functionally equivalent to magic items. The physical gifts aren't that great, mostly being equal to the weakest versions of a stat-boosting item (ie a Gift of Dexterity gives the same bonus as a 4,000 gp pair
+2 gloves of Dexterity). The magic-boosting ones are based on
metamagic rods though, so a spellcaster with the Gift of Empowerment effectively has a 73,000 gp
greater metamagic rod of empower.
The Enlarge and Extend gifts match less powerful 24,500 gp rods.
The bigger issue is the worms are equivalent to SLOTLESS magic items so, so a character can benefit from them all simultaneously rather than only be able to wield one at a time like a
metamagic rod. that's 224,000 gp-equivalent if you use the SRD "double price for no space limitation" rule, which'll put NPC-type characters well above their wealth by level. Even a 20th level NPC is only supposed to have 200k worth in gear.
The question is how much does the 4 hp per worm cost balance that, especially when it can be partially or entirely offset by a Constitution worm? A 12th level caster with a Con worm plus two magic worms has the same HP as a "wormless" character.