uncommon le huge dragon 

Perception +15; darkvision, scent (imprecise) 30 feet

Languages Common, Draconic, Tratrith

Skills Deception +20, Diplomacy +18, Intimidation +18, Society +16, Stealth +16

Str +6 Dex +2 Con +3 Int +4 Wis +3 Cha +6

AC  27; Fort +18, Ref +15, Will +18; +2 circumstance to all saves to disbelieve illusions

HP 135; Immunities paralyzed, sleep; Resistances acid 10, poison 10

Speed 40 feet, climb 20 feet, fly 60 feet

Melee [>] jaws +20 (reach 15 feet), Damage 2d12+9 piercing

Melee [>] tail +20 (reach 15 feet), Damage 2d6+9 bludgeoning plus Improved Grab

Occult Innate Spells DC 26; 3rd nondetection; 2nd humanoid form

Constrict [>] 1d6+6 bludgeoning, DC 26

Eight Coils A bida can Strike with its tail even while Grabbing creatures with it. The bida can have up to eight Medium or smaller creatures grabbed with its tail at a time; it can also grab Large creatures, but they count as four Medium creatures for this purpose.

Mask Settlement (arcane, illusion) By concentrating for 4 hours, the bida hides a small settlement. This is a 5-th level hallucinatory terrain spell, except the area is a 500-foot burst and creatures are invisible while inside structures in the area. The bida can conceal only one settlement at a time, and must concentrate on the effect for 10 minutes at the beginning of each day to maintain the illusion.

Age of Ashes #2: Cult of Cinders, page 81.