Law's Ebberon Monster #1 (Shavarath Mouther)

Heres the first of my monsters that I have posted. The a good print vershon can be found at Morgrave Univeristy. I hope you like this creature.

Shavarath Mouther
Large Outsider (Chaotic, Extraplanar, Evil, Tanari’ri)
Hit Dice: 6d8+36 (57 hp)
Initiative: +6 (+2 Dex, +4 Improved Initiative)
Speed: 50 ft.
AC: 17 (-1 Size, +2 Dex, +6 natural), touch 11, flat-footed 15
Base Attack/Grapple: +6/+18
Attack: Bite +13 (3d6+12/18-20/x3)
Full Attack: Bite +13 (3d6+12/18-20/x3
Space/Reach: 10 ft./10 ft.
Special Attacks: Augmented critical, Increased Damage, Rend fallen
Special Qualities: DR 5/good, Darkvision 60 ft., immunity to electricity and poison, resistance to acid 10, cold 10, and fire 10, spell resistance 15, summon tanar’ri, telepathy 100 ft.
Saves: Fort +11, Ref +7, Will +6
Abilities: Str 27, Dex 14, Con 22, Int 8, Wis 13, Cha 12
Skills: Bluff +11, Climb +16, Escape Artist +12, Intimidate +11, Jump +16, Listen +13, Spot +13
Feats: Alertness, Improved Initiative, Improved Natural Attack (bite)
Environment: Shavarath
Organization: Solitary, pair, or gang (3-15)
Challenge Rating: 7
Treasure: Standard
Alignment: Always Chaotic Evil
Advancement: 7-12 HD (Large), 13-18 (Huge)
Level Adjustment: -

A large ball looking creature, with blood red skin stands in front of you. You see its overly large mouth, and for small eyes. Its for stubby feet seam to carry it at a good pace as it comes toward you.

Common shock troops for the demon armies in the battle plane of Shavarath. This large demon loves to fight and eat its latest kill as it dies. Known to eat things that would take days for other things to eat in a few minutes or even a few seconds (like eating an elephant in a few minutes not a few days).

Combat
Shavarath mothers more so then there lesser kin love to tear their opponents in little peace’s and such don’t use much but there mouth in combat. There bit as been known to kill even after they have been killed. A Shavarath Mother can be summoned with a Summon Monster VI spell.
Augmented Critical (Ex): The Shavarath mouthers bite attack threatens a critical hit on a natural attack roll of 18-20, dealing triple damage on a successful critical hit.
Poison (Ex): Injury, Fortitude DC 19, initial damage 1d6 Con, secondary damage 1d6 Con. The save DC is Constitution-based.
Rend Fallen (Ex): An Shavarath mouther loves to tear into its downed foes. It automatically deals an additional 2d6+12 points of damage to any foe it drops with a melee attack.
Summon Tanar’ri (Sp): Once per day, an Shavarath mouther can attempt to summon another Shavarath mouther with a 60% chance of Success.
Increased Damage (Ex): Because of their sharp teeth, a Shavarath mouthers deal damage as if they were one size larger.