Blood River

Spider Climb. The Blood River can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Web Sense. While in contact with a web, the Blood River knows the exact location of any other creature in contact with the same web.

Web Walker. The Blood River ignores movement restrictions caused by webbing.

Hardened Body. The Blood River doesn't take any damage from attacks on the body. 

Feasting. After Successfully Consuming an Enemy, the Blood River regains 4d20+9 Health.

Bloodthirst. If the Blood River kills an enemy, the next strike it does will do an additional 3d6 Acid Damage.

Ambush Predator. The Blood River does 5x More damage against unsuspecting foes and Prone Enemies.

Pierce. The Blood River Slams one of its feet down, piercing the enemy and doing 3d10 Piercing Damage as well as 2d4 Poison Damage for 1d4 Turns. The enemy is stuck on the leg until they succeed a Dc15 Strength check or the Blood River lets the enemy go.

Spit Web. The Blood River spits a large web covering a 30 foot (Diameter) circle, any enemy in this circle is restrained for the Webs duration. Which is 1d8.

Piercing Acid. The Blood River shoots a condensed shot of Acid up to 100 feet away dealing 3d8+1 Acid Damage and Knocking the Enemy Prone for 1d4 turns.

Bite. The Blood River bites forth 10 feet, dealing 3d6 Piercing Damage and 1d10 + 5 Poise Damage for 2d4+1 Turns.

Spell Absorb. If an offensive spell hits the Body of the Blood River, the Blood River makes a DC11 constitution check. If successful, the next cast of Moonlight Ray does 2d6 More Radiant Damage. If unsuccessful, no Bonus effects and the damage is Nullified. 

Moonlight Ray 2/Day. The Blood River shoots a Ray of Pure Moonlight up to 200 Feet away, Dealing 3d20+3 Radiant Damage. This Ray can pierce targets.