uncommon ce medium fiend 

Perception +18; darkvision

Languages Abyssal, Common; speak with animals

Skills Athletics +19, Crafting +11, Intimidation +15 (+17 against humanoids), Religion +11, Survival +17

Str +6 Dex +2 Con +4 Int +0 Wis +4 Cha +2

Items javelins (3), longspear, trophies (animal, beast, and humanoid)

AC  25; Fort +18, Ref +12, Will +15

HP 160; Weaknesses cold 5, good 5; Resistances fire 10

Attack of Opportunity [R]

Speed 30 feet; freedom of movement

Melee [>] jaws +18, Damage 2d10+8 piercing

Melee [>] longspear +18 (reach 10 feet), Damage 1d8+8 piercing plus wicked trophies

Ranged [>] javelin +14 (thrown 30 feet), Damage 1d6+8 piercing plus Wicked

Divine Innate Spells DC 23; 4th creation; 3rd earthbind (at will), fear (at will); 2nd death knell (at will); 1st charm (at will); Constant (4th) freedom of movement, speak with animals

Reptile Master When an ahvothian uses an innate spell against a reptile, the DC is 27 rather than 23.

Wicked Trophies An ahvothian chooses a creature type (such as animal, celestial, or humanoid) from which they currently carry a trophy from a past kill. Their weapon Strikes against creatures of that type deal an additional 1d10 damage and they gain a +2 status bonus on Intimidation checks against creatures of that type. The ahvothian doesn't lose these bonuses if they lose the trophies. Once per day, an ahvothian can change the creature type of their wicked trophies in a ritual that takes 1 hour. Nearly all ahvothians encountered on the Material Plane have selected humanoids as the focus of their wicked trophies.

The Slithering, page 62.