Creatures of the Yuan-ti. Over millennia of experimentation, the yuan-ti have transformed various scaly reptilian animals into monstrosities that share some of their traits. Called ti-khana, these prized pets are carefully trained to serve their ophidian masters. All ti-khana are resistant to magic like yuan-ti and possess the innate ability to detect magic. The majority of ti-khana also have venomous fangs, the ability to transform into a poisonous snake, and some kind of supernatural or magical attack.
 Ti-khana require the dark magic and alchemy of the yuan-ti to breed and develop their powers. Ti-khana can survive in the wild, but it is unlikely they can reproduce properly without the yuan-ti's arcane treatments. It is possible some types of ti-khana can mate with their unaltered relatives or lay viable eggs with their own kind. However, feral offspring can not develop ti-khana abilities without yuan-ti intervention so, at best, would grow into beasts resembling the ti-khana's mundane ancestors.
 Breeding and training ti-khana is usually performed by specialist yuan-ti spellcasters, but an edifice can be enchanted to perform this task for one or more strains of ti-khana. This allows ancient yuan-ti sites to have a population of ti-khana "guarddogs" even if no yuan-ti has visited them for millennia.

VARIANT: ALTERNATIVE CERATOPSIANS
A ti-khana triceratops may have different patterns and color of crystals set in its skull and horns, and the shape and position of its head crest and horns can vary greatly. Such creatures often have other species of Ceratopsia in their ancestry or are a different genus than Triceratops. Some ti-khana ceratopsians have blunt facial buttresses or a sharp beak instead of the lancelike horns of the triceratops variety, instead of a Gore attack doing piercing damage, these variants have slashing damage Bite attack or a bludgeoning damage Slam attack with the same numerical values.
 Instead of a Telekinetic Bomb attack, an alternative ti-khana ceratopsian has one of the following:
 Fireball (Recharge 5-6). A bright streak flashes from the ti-khana ceratopsian's nose horn to a point within 150 feet and explodes into flames. Each creature in a 20-foot-radius sphere centered on that point must make a DC 16 Dexterity saving throw, taking 28 (8d6) fire damage on a failed save, or half as much damage on a successful one.
 Mindburst (Recharge 5-6). The ti-khana ceratopsian emits psionic energy in a 60-foot cone. Each creature in that area must succeed on a DC 16 Intelligence saving throw or take 18 (4d6 + 4) psychic damage and be stunned for 1 round. On a success, the target takes half damage and is not stunned.
 Thunderbolt (Recharge 3-6). Ranged Weapon Attack: +10 to hit, range 600 ft., one target. Hit 18 (4d6 + 4) lightning damage plus 18 (4d6 + 4) sonic damage.
 Vitriol Beam (Recharge 5-6). The ti-khana ceratopsian's nose horn projects rays of venomously corrosive energy in a 60-foot line that is 5 feet wide. Each creature in that line takes 5 (1d10) acid damage plus 5 (1d10) poison damage and must make a DC 16 Constitution saving throw on their turn the next round. If they fail, they take an additional 5 (1d10) acid damage plus 5 (1d10) poison damage and are poisoned for 1 hour.

(Based on a monster from the Fiend Folio (2003).)