The following material is Open Game Content from Legendary II: Legendary Weapons
The Great Serpent CR 15 (XP 51,200)
Advanced crag linnorm
CE Gargantuan dragon
Init +10; Senses darkvision 120 ft., low-light vision, scent, true seeing; Perception +24
AC 33, touch 12, flat-footed 27 (+6 Dex, +21 natural, -4 size)
hp 232 (15d12+135); regeneration 10 (cold iron)
Fort +18, Ref +17, Will +15
Defensive Abilities freedom of movement; DR 15/cold iron; Immune curse effects, fire, mind-affecting effects, paralysis, poison, sleep; SR 25
Speed 40 ft., fly 100 ft. (average), swim 60 ft.
Melee bite +25 (2d8+14/19-20 plus poison), 2 claws +25 (1d8+14), tail +20 (2d6+7 plus grab)
Space 20 ft.; Reach 20 ft.
Special Attacks breath weapon, constrict (tail, 2d6+21), death curse
Str 38, Dex 22, Con 29, Int 9, Wis 22, Cha 25
Base Atk +15; CMB +33 (+35 bull rush, +37 grapple); CMD 49 (51 vs. bull rush, can’t be tripped)
Feats Blind-Fight, Cleave, Combat Reflexes, Improved Bull Rush, Improved Critical (bite), Improved Initiative, Lightning Reflexes, Power Attack
Skills Fly +18, Intimidate +25, Perception +24, Sense Motive +24, Swim +40
Languages Aklo, Draconic, Sylvan
Breath Weapon (Su) Once every 1d4 rounds as a standard action, a crag linnorm can expel a 120-foot line of magma, dealing 15d8 points of fire damage to all creatures struck (Reflex DC 26 halves). This line of magma remains red-hot for 1 round after the linnorm creates it. Creatures that took damage on the first round take 6d6 fire damage the second round (Reflex DC 26 negates), as does any creature that walks across the line of magma. If the magma was expelled while the linnorm was airborne, it instead rains downward during the second round as a sheet of fire no more than 60 feet high that does 6d6 damage (Reflex DC 26 negates) to any creature that passes through it. On the third round, the line of magma cools to a thin layer of brittle stone that quickly degrades to powder and sand over the course of several hours; magma that’s turned to a sheet of fire is consumed entirely during the second round, leaving behind only a stain of smoke in the air that swiftly disperses. The save DC is Constitution-based.
Death Curse (Su) When a creature slays a crag linnorm, the slayer is affected by the curse of fire. Curse of Fire: save Will DC 24; effect creature gains vulnerability to fire. The save DC is Charisma-based.
*Freedom of Movement (Ex)** A crag linnorm is under the constant effect of freedom of movement, as per the spell of the same name. This effect cannot be dispelled.
Poison (Su) Bite—injury; save Fort DC 26; frequency 1/ round for 10 rounds; effect 2d6 fire damage and 1d4 Con drain; cure 2 consecutive saves. The save DC is Constitution-based.
True Seeing (Ex) A crag linnorm has constant true seeing, as per the spell of the same name.