This towering predator has an enormous head and a mouth full of dagger-sized teeth. It stands on two powerful legs and has only vestigial forelimbs.
As a summoned, template, creature, this creature has several changes. Anything noted with  is what it gains from the template associated with the summoners’ alignment. Divine is always listed first, and Unholy afterwards.
N Gargantuan Divine / Unholy Magical Beast (Reptilian, [holy/shadow])
Init +5; Senses Darkvision 60 ft. [-/darkvision 120 ft. and see in darkness], low-light vision, scent; Perception +37
[Aura Sacred Aura/Profane Aura]
AC 21, touch 7; flat-footed 20 (+1 dex, +14 natural, -4 size)
hp 126 (12d10+60)
Fort +13, Ref +9, Will +8
[Resist holy 15/shadow 15]
Weakness Ice, [shadow/holy]
Speed 40 ft.
Melee Bite +23 (4d6+22/19-20 [+2d6 holy/shadow] plus grab)
Space 20 ft.; Reach 20 ft.
Special Attacks Earthquake, Swallow Whole (2d8+11, AC 17, hp 12), [Radiant Blast, Sacredness/Twilight Blast, Profane Attacks]
Str 32, Dex 13, Con 20, Int 2, Wis 15, Cha 10
Base Atk +12; CMB +27 (+31 grapple); CMD 40
Feats Bleeding Critical, Critical Focus, Diehard, Endurance, Improved Critical (bite), Improved Initiative, Iron Will, Run, Skill Focus (Perception)
Skills Perception +37; Racial Modifiers Perception +8
SQ Powerful Bite
Once every 1d4 rounds as a standard action, A t-rexaur can cause the ground to erupt around it within a 30-ft.-radius. Creatures within the area of effect take 8d6 points of earth damage and are inflicted with the Weighted status effect for 1d6 rounds (Reflex save DC 21 for half damage and negates the status effect). Blue mages may learn this ability as a 4th level spell (Knowledge: Arcana DC 23).
Powerful Bite (Ex)
A t-rexaur applies twice its Strength modifier to bite damage.
Divine – Sacred Aura (Su)
A divine creature emits supernatural light in a 10-foot radius around it. All those within the area of effect take 3d6 holy damage. A divine creature can suppress or resume the use of this ability as a free action.
Divine – Radiant Blast (Su)
Once per day, a divine creature can increase the radiance of its form and release it in a cone-shaped blast to a range of 60 feet that deals 2d6 points of holy damage and blinds any creature in the area for 1d4+1 rounds. Affected creatures can make a successful Reflex save (DC 21) to halve the damage and avoid being blinded. The save DC is Constitution-based.
Divine – Sacredness (Su)
Each of a divine creature’s melee attacks with a natural or manufactured weapon deal +50% more holy damage against creatures of evil alignment. All of its natural and manufactured weapons are treated as good-aligned for overcoming damage reduction.
Unholy – Profane Aura (Su)
An unholy creature emits supernatural darkness in a 10-foot radius around it. All those within the area of effect take 3d6 shadow damage. An unholy creature can suppress or resume the use of this ability as a free action.
Unholy – Twilight Blast (Su)
Once per day, an unholy creature can increase the darkness of its form and release it in a line blast to a range of 80 feet that deals 2d6 points of shadow damage and silences any creature in the area for 1d2+1 rounds. Affected creatures can make a successful Reflex save (DC 21) to halve the damage and avoid being silenced. The save DC is Constitution-based.
Unholy – Profane Attacks (Su)
Each of an unholy creature’s melee attacks with a natural or manufactured weapon deal +50% more shadow damage against creatures of good alignment. All of its natural and manufactured weapons are treated as evil-aligned for overcoming damage reduction.