Ti-Khana Deinonychus (CR 5)

Large Magical Beast
Alignment: Always chaotic evil
Initiative: +3 (Dex); Senses: darkvision 60 ft., low-light vision, scent, Listen +10, and Spot +10

AC: 21 (-1 size, +3 Dex, +9 natural), touch 12, flat-footed 18
Hit Dice: 48+16 (34 hp)
Fort +8, Ref +7, Will +2
Speed: 60 ft.
Space: 10 ft./10 ft.
Base Attack +4; Grapple +12
Attack: Talons +7 melee
Full Attack: Talons +7 melee and 2 foreclaws +2 melee and bite +2 melee
Damage: Talons 2d6+4, foreclaw 1d3+2, bite 2d4+2 plus poison
Special Attacks/Actions: Poison, psionics
Abilities: Str 19, Dex 17, Con 19, Int 4, Wis 12, Cha 10
Special Qualities: SR 16
Feats: Run; Track
Skills: Hide +9, Jump +14, Listen +10, Spot +10, and Survival +10*
Advancement: 5-8 HD (Large)
Climate/Terrain: Warm forest and underground
Organization: Solitary, pair, or pack (3-6)
Treasure/Possessions: -

Source: Fiend Folio

Poison (Ex): A ti-khana deinonychus delivers its poison (Fort DC 16 negates) with each successful bite attack. Initial and secondary damage are the same (1d6 Con).

Psionics (Sp): A ti-khana deinonychus can produce the following effects at will.

Detect Poison: As the spell cast by a 6th-level sorcerer.

Alternate Form: A ti-khana deinonychus can assume the form of a Tiny to Large viper (see the Monster Manual). The ti-khana deinonychus uses its own or the viper's poison, whichever it prefers.

Aversion: A ti-khana deinonychus creates a compulsion effect targeting one creature within 30 feet. The subject must succeed on a Will save (DC 17) or gain an aversion to snakes for 10 minutes. Affected subjects must stay at least 20 feet from any snake, yuan-ti, or ti-khana, alive or dead; if already within 20 feet, they move away. A subject can overcome the compulsion by making another Will save (DC 17), but still suffers from deep anxiety. This anxiety causes a -4 penalty to Dexterity until the effect wears off or the subject is no longer within 20 feet of a snake, yuan-ti, or ti-khana. This ability is otherwise similar to antipathy as cast by a 16th-level sorcerer.

Scent (Ex): A ti-khana deinonychus can detect approaching enemies, sniff out hidden foes, and track by sense of smell.

Skills: A deinonychus has a +8 racial bonus on Hide, Juimp, Listen, Spot, and Survival checks. *The bonus on Survival checks increases to +12 when tracking by scent.

A ti-khana deinonychus leaps at prey, tearing with its talons (counting as a single attack), grasping with its foreclaws, and biting with its terrible jaws adding a toxic venom to the deinonychus's already fearsome attack routine.