Lizard Kingdoms / Yuan Ti
The original plot had the players pursuing a prince that had been kidnapped by the Yuan Ti. After a long time, the players finally caught up with them in the Lizard Kingdoms (from Beyond Countless Doorways.)
I was disappointed not to have full stat blocks for Psionic Yuan Ti... so I did them myself. I also did some classes examples.
Yuan-Ti Pureblood - Monstrous Humanoid 4: CR 3; Size M; HD 4d8; hp 18; Init +5 (+1 Dex, +4 Improved Initiative); AC 17 (+1 Dex, +1 natural, +3 masterwork studded leather, +2 masterwork heavy shield); Attack: scimitar +5 melee (1d6/18-20), or longbow +6 ranged (1d8/x3); SA Spell-like abilities, psionics; SQ alternate form, darkvision 60 ft., PR 14; SV Fort +1, Ref +5, Will +4; AL CE; Str 11, Dex 13, Con 11, Int 12, Wis 10, Cha 12.
Languages: Abyssal, Common, Draconic, Yuan-Ti.
Skills and feats: Concentration +7, Disguise +4*, Hide +3, Knowledge (any one)+5, Listen +4, Spot +4; Alertness*, Blind-fight*, Dodge, Improved Initiative.
Alternate Form (Sp): Tiny to Large viper, as polymorph self (19th level.)
Psionics (Ps): At will – detect hostile intent, psionic charm (animals, fey, giants, humanoids, magical beasts, and monstrous humanoids, DC 13*), psionic daze (6 HD, DC 12*), 1/day – aversion (DC 13), concealing amphora, darkness, entangling ectoplasm (large creature). Manifester level 3.
Yuan-Ti Halfblood – Monstrous Humanoid 7: CR 3; Size M; HD 7d8+7; hp 38; Init +5 (+1 Dex, +4 Improved Initiative); AC 20 (+1 Dex, +4 natural, +3 masterwork studded leather, +2 masterwork heavy shield); Attack: scimitar +10/+5 melee (1d6+2/18-20) and bite +4 melee (1d6+1 + poison), or masterwork composite longbow +9/+4 ranged (1d8+2/x3); SA psionics, poison; SQ alternate form, darkvision 60 ft., PR 16; SV Fort +3, Ref +6, Will +9; AL CE; Str 15, Dex 13, Con 13, Int 18, Wis 18, Cha 16.
Languages: Abyssal, Common, Draconic, Yuan-Ti.
Skills and feats: Concentration +11, Craft or Knowledge +14 (any two), Hide +10*, Listen +16, Spot +16; Alertness*, Blind-fight*, Combat Expertise, Dodge, Improved Initiative.
Alternate Form (Sp): Tiny to Large viper, as polymorph self (19th level.)
Poison: Injury DC 14, initial and secondary damage 1d6 Con.
Psionics (Ps): At will – chameleon, detect hostile intent, exhalation of the black dragon; 3/day – aversion (DC 16), concealing amphora, entangling ectoplasm, (huge creatures*), psionic charm (all targets, DC 16*), psionic daze (9 HD, DC 14*), deeper darkness, mind thrust (ML 4th, 4d10, DC 15*); 1/day – body purification (3 points*), psionic suggestion (two targets, DC 15*).
* - Adjusted for manifester level.
Skills: Halfblood yuan-ti using the chameleon power receive a +10 to hide checks.
Variants: (Above is snake headed variant)
Snake arm variant: Instead of scimitar and bite attack, two bite attacks (1d4+2 + poison, poison damage as above).
Snake tail plus human legs (move 30 ft., swim 15 ft. constrict small or smaller creatures 1d4+3 damage)
Snake tail instead of human legs (move 20 ft., climb 15 ft., swim 15 ft., constrict medium or smaller creatures for 1d6+3.)
Yuan-Ti Abomination – Monstrous Humanoid 9: CR 3; Size L; HD 9d8+27; hp 67; Init +5 (+1 Dex, +4 Improved Initiative); Speed 30 ft., climb 20 ft., swim 20 ft., AC 22 (-1 Size, +1 Dex, +10 natural, +2 masterwork heavy shield); Attack: scimitar +13/+8 melee (1d8+4/18-20) and bite +7 melee (2d6+3 + poison), or masterwork composite longbow +9/+4 ranged (2d6+4/x3); space/reach 10 ft/10 ft; SA constriction, improved grab, poison, psionics; SQ alternate form, darkvision. 60 ft., PR 18; SV Fort +6, Ref +7, Will +11; AL CE; Str 19, Dex 13, Con 17, Int 20, Wis 20, Cha 18.
Languages: Abyssal, Common, Draconic, Yuan-Ti.
Skills and feats: Concentration +15, Craft or Knowledge +17 (any two), Hide +8*, Listen +19, Move Silent 12, Spot +19; Alertness*, Blind-fight*, Combat Expertise, Dodge, Improved Initiative, Mobility.
Alternate Form (Sp): Tiny to Large viper, as polymorph self (19th level.)
Constrict: 1d6+6 points.
Improved Grab: If hit Large or smaller creature with bite attack, can start constrict with tail as a free action.
Poison: Injury DC 14, initial and secondary damage 1d6 Con.
Psionics (Ps): At will – aversion (DC 19*), chameleon, psionic daze (12 HD, DC 15*), detect hostile intent, entangling ectoplasm, (colossal creatures*), exhalation of the black dragon (5d6*); 3/day –body purification (6 points*), psionic charm (all targets, 1 day/level, DC 19*), concealing amphora, deeper darkness, mind thrust (ML 7th, 7d10, DC 18*), psionic suggestion (four targets, DC 16*); 1/day –baleful polymorph (DC 19). Manifester level 9th.
* - Adjusted for manifester level.
Skills: Abomination yuan-ti using the chameleon power receive a +10 to hide checks.
Abominations receive +8 racial bonus to swim checks, and may always take 10 on swim checks.
Classed Yuan-Ti:
Yuan-Ti Pureblood Psychic Warrior 4 - Monstrous Humanoid 4/ PysWar 4: CR 7; Size M; HD 8d8+8; hp 47; Init +7 (+3 Dex, +4 Improved Initiative); AC 19 (+3 Dex, +1 natural, +3 masterwork studded leather, +2 masterwork heavy shield); Attack: scimitar +9 melee (1d6+2/18-20), or longbow +10 ranged (1d8+2/x3); SA Spell-like abilities, psionics; SQ alternate form, darkvision 60 ft., PR 14; SV Fort +6, Ref +8, Will +8; AL CE; Str 14, Dex 16, Con 12, Int 12, Wis 16, Cha 10.
Languages: Abyssal, Common, Draconic, Yuan-Ti.
Skills and feats: Autohypnosis +7, Concentration +12, Disguise +3*, Hide +5, Knowledge (psionics) +5, Knowledge (the planes)+5, Listen +7, Spot +7; Alertness*, Blind-fight*, Dodge, Improved Initiative.
Alternate Form (Sp): Tiny to Large viper, as polymorph self (19th level.)
Psionics (Ps): At will – detect hostile intent, psionic charm (animals, fey, giants, humanoids, magical beasts, and monstrous humanoids, DC 13*), psionic daze (6 HD, DC 12*), 1/day – aversion (DC 13), concealing amphora, darkness, entangling ectoplasm (large creature). Manifester level 3.
Psychic Warrior Powers (11 PP): 1st - prevenom weapon, stomp, prescient defense; 2nd - Animal affinity.