Ancient Rift Dragon CR 21

XP 409,600
CE Gargantuan dragon (chaotic, evil, extraplanar)
Init +3; Senses dragon senses; Perception +38
Aura frightful presence (300 ft., DC 32)

DEFENSE

AC 40, touch 5, flat-footed 40 (–1 Dex, +35 natural, –4 size)
hp 434 (28d12+252)
Fort +25, Ref +19, Will +23
DR 15/good; Immune acid, disease, nausea, paralysis, poison, sleep, stun; SR 32

OFFENSE

Speed 60 ft., burrow 30 ft., fly 250 ft. (clumsy)
Melee bite +40 (4d6+22/19–20 plus bleed), 2 claws +40 (2d8+15/19–20 plus bleed), tail slap +37 (2d8+22/19–20), 2 wings +37 (2d6+7)
Space 20 ft.; Reach 10 ft. (15 ft. with bite)
Special Attacks abyssal juggernaut, bleed 10, breath weapon (60-ft. cone, 20d10 acid, Reflex DC 33 half), corrosion, crush, dissolution, flatten, foul acid, tail sweep, trample (4d6+22 plus bleed, DC 39)
Oracle Spells Known (CL 15th; concentration +23)

7th (5)—blasphemy (DC 25), destruction (DC 25)
6th (7)—epidemic (DC 24), harm (DC 24), heal
5th (7)—cure critical wounds, dispel good, plane shift (DC 23), true seeing
4th (8)—dismissal (DC 22), divine power, freedom of movement, unholy blight (DC 22)
3rd (8)—contagion (DC 21), cure serious wounds, deeper darkness, dispel magic
2nd (8)—death knell (DC 20), desecrate, hold person (DC 20), shatter (DC 20), sound burst (DC 20)
1st (8)—bane (DC 19), cure light wounds, murderous command (DC 19), obscuring mist, shield of faith
0 (at will)—bleed (DC 18), create water, detect magic, detect poison, guidance, read magic, resistance, spark (DC 18), virtue

STATISTICS

Str 41, Dex 8, Con 29, Int 22, Wis 25, Cha 26
Base Atk +28; CMB +47; CMD 56 (60 vs. trip)
Feats Critical Focus, Flyby Attack, Improved Critical (bite, claw, tail slap), Improved Initiative, Intimidating Prowess, Lightning Reflexes, Multiattack, Power Attack, Quicken Spell, Staggering Critical, Weapon Focus (bite, claw)
Skills Bluff +39, Fly +16, Intimidate +54, Knowledge (arcana, dungeoneering, planes, religion) +37, Perception +38, Sense Motive +38, Spellcraft +37, Stealth +18, Use Magic Device +39
Languages Abyssal, Common, Draconic
SQ planar infusion (300 ft.)

ECOLOGY

Environment any (Abyss)
Organization solitary
Treasure triple

Wherever they go, rift dragons leave behind shattered ruins.

These scaled terrors often intimidate local humanoid groups into worshiping them as demigods of destruction.