DC21; Check result = 27. (6 pts, over,)
This is indeed a hybrid (Common name: Demi-Gorgon Hydra.)
SPECIAL ABILITIES:
SA – Breath Weapon (Su): Turn to stone permanently, cone, 40 ft., every 1d6 rounds, 8/day, Fort save DC 22 negates.
SQ – Regenerating Heads (Ex): 11 heads, 12 hp each, can be severed with sunder attack made with slashing weapon. Successfully severing a head does 6 hp damage to the hydra’s body. 1d4 rounds after a head is severed, two new heads grow from its stump, up to maximum total of 22 heads at one time. Dealing 5 hp of fire or acid damage to the stump of a severed head before the new heads regenerate seals the stump and prevents regeneration.