This is balanced to fit into a Tome game. So it might look a bit overpowered by normal standards.
Here are some Tome caster PrCs to compare it with. And if someone has a better name, I'm all ears. It is supposed to be "worshipping" fiendish
ha nagas, instead of couatls, maybe as some kind of cult worshipping a specific fiendish ha naga.
Naga ApostlePrereqs: Able to cast 3rd level arcane spells, Knowledge (Planes or Dungeoneering) 4, non-good
HD: d4 (Same as Rainbow Servant)
BAB: medium
Saves: Good Will, Bad Ref and Fort
Skills: 4 per level
Class skills: Bluff, Hide, Move Silently, Disguise, Gather Information, Diplomacy, Use Magic Device, Knowledge (all), Spellcraft, Concentration
Spellcasting: +1 at every level
Naga Apostle 1 Detect Good (at will, as Paladin's Detect Evil),
Evil subtype,
ImmortalityNaga Apostle 2
Attune Domain (
Charm)
Naga Apostle 3 Heat Vision (Darkvision 60', or double range if already have it)
Naga Apostle 4 Attune Domain (
Travel)
Naga Apostle 5 Forked Tongue (add class level to Bluff as a racial bonus, can take 10 on Bluff)
Naga Apostle 6 Magical Flight (60', perfect)
Naga Apostle 7 Snake in the Grass (add class level to Hide as a racial bonus, can take 10 when hiding)
Naga Apostle 8 Attune Domain (
Trickery)
Naga Apostle 9 False Skin (add class level to Disguise as a racial bonus, can take 10 on this skill)
Naga Apostle 10 Cleric Spell Access (as Rainbow Servant)
Snake in the Grass: As the Dark Serpent's powers grow, he gains the ability to manipulate the coloring of his own skin. At 6th level, this allows him to add his class level to Hide checks, and take 10 while hiding (normally impossible as it is an opposed check).
False Skin: At 9th level, his control of his chameleon powers has improved to the point where he can make fine manipulations to aid him in using the Disguise skill. He adds his class level as a racial bonus to Disguise checks, and can take ten on them.