SENSEN the Great Black Wyrm


Gargantuan Dragon (Water)
Hit Dice: 37d12+259 (500 hp)
Initiative: +4
Speed: 60 ft, fly 200 ft (clumsy), swim 60 ft
AC: 42 (-4 size, +36 natural)
Attacks: Bite +48 melee, 2 claws +43 melee, 2 wings +43 melee, tail slap +43 melee
Damage: Bite 4d6+15, claw 2d8+7, wing 2d6+7, tail slap 2d8+22
Face/Reach: 20 ft by 40 ft / 15 ft
Special Attacks: Breath weapon, spell-like abilities, corrupt water, charm reptiles, frightful presence
Special Qualities: Water breathing, immunities, DR 20/+3, blindsight, keen senses, SR 28
Saves: Fort +27, Ref +20, Will +27
Abilities: Str 41, Dex 10, Con 24, Int 19, Wis 24, Cha 23
Skills: Bluff +43, Concentration +44, Diplomacy +43, Escape Artist +37, Knowledge (history) +41, Listen +44, Scry +41, Search +41, Sense Motive +44, Spellcraft +41, Spot +44
Feats: Hover, Flyby Attack, Power Attack, Cleave, Snatch, Improved Initiative, Rend (if both claws hit, then +4d8+15 damage), Wingstorm (hurricane force), Wingover, Clinging Breath

Challenge Rating: 21
Alignment:  chaotic evil

SA–Breath Weapon (Su): Line of acid, 120 feet long, every 1d4 rounds; damage 24d4, Reflex half DC 35.
SA–Frightful Presence (Ex): Dragons can unsettle foes with their mere presence. This ability takes effect automatically (radius 360 ft) whenever the dragon attacks, charges, or flies overhead. A potentially affected creature (one with less than 37 HD) that succeeds at a Will save (DC 34) remains immune to that dragon's frightful presence for one day. On a failure, creatures with 4 or fewer HD become panicked for 4d6 rounds and those with more than 5 HD become shaken for 4d6 rounds. Dragons ignore the frightful presence of other dragons.
SA–Spell-Like Abilities: 3/day - darkness (radius 120 ft) and insect plague; 1/day - plant growth.
SA–Corrupt Water (Sp): Once per day this dragon can stagnate 10 cubic feet of water, making it become still, foul, and unable to support animal life. This ability spoils liquids containing water. Magic items (such as potions) and items in a character's possession must succeed at a Will save (DC 33) or become fouled.
SA–Charm Reptiles (Sp): 3/day, this dragon can use this ability. It operates as a mass charm spell that works only on reptilian animals. The dragon can communicate with any charmed reptiles as though casting a speak with animals spell.
SQ–Immunities (Ex): Immune to acid, sleep, paralysis.
SQ–Water Breathing (Ex): This dragon can breathe underwater indefinitely and can freely use its breath weapons, spells, and other abilities while submerged.
SQ–Blindsight (Ex): Dragons can ascertain creatures by nonvisual means (mostly hearing and scent, but also by noticing vibrations and other environmental clues); this dragon's range is 360 feet.
SQ–Keen Senses (Ex): Dragons can see four times as well as humans in low-light conditions and twice as well in normal light. They also have darkvision (range 1200 feet).
Spells Known (cast 6/8/8/7/7/7/7/4; as a level 15 sorcerer): 0–detect magic, resistance, detect poison, read magic, dancing lights, ghost sound, mage hand, open/close, mending; 1–endure elements, mage armor, shield, true strike, charm person; 2–bull's strength, cat's grace, blur, endurance, fog cloud; 3–haste, dispel magic, protection from elements, slow; 4–dimension door, improved invisibility, detect scrying, confusion; 5–cloudkill, dominate person, summon monster V, teleport; 6–greater dispelling, disintegrate, programmed image; 7–spell turning, greater scrying.

Sensen is a great wyrm that lives on Eha Ayshnekht, ruling the vast swamp of that island.  Worshipped as a god by the lizard folk and the saurials, Sensen forces the saurials to sacrifice members of their tribes to him once per year or he rises forth from the swamp and destroys their villages.

Eha Ayshnekht, Isle of Dinosaurs