| Hit Dice: | 12d10+36 (102 hp) |
| Initiative: | +6 |
| Speed: | 20 ft. (4 squares), fly 60 ft. (average) |
| Armor Class: | 18 (–2 size, +2 Dex, +8 natural), touch 10, flat-footed 16 |
| Base Attack/Grapple: | +12/+25 |
| Attack: | Bite +15 melee (2d8+5) or sonic lance +12 ranged touch (6d6) |
| Full Attack: | Bite +15 melee (2d8+5) and 2 claws +13 melee (1d6+2); or sonic lance +12 ranged touch (6d6) |
| Space/Reach: | 15 ft./10 ft. |
| Special Attacks: | Sonic lance, explosion |
| Special Qualities: | Blindsight 120 ft., immunities, vulnerability to sonic |
| Saves: | Fort +11, Ref +10, Will +5 |
| Abilities: | Str 20, Dex 14, Con 17, Int 7, Wis 13, Cha 11 |
| Skills: | Listen +12, Move Silently +10; racial bonuses |
| Feats: | Endurance, Flyby Attack, Improved Initiative, Multiattack, Snatch |
| Environment: | Temperate mountains |
| Organization: | Solitary or clutch (2–4) |
| Challenge Rating: | 9 |
| Treasure: | None |
| Alignment: | Often neutral |
| Advancement: | 13–16 HD (Huge); 17–36 HD (Gargantuan) |
| Level Adjustment: | — |
This creature resembles an eyeless, yellow-green flying reptile with fleshy wings, a long tail, and a large fin on its back. It has single hornlike protrusion on its crocodilian head.
A strange predator from desolate wastelands, the yrthak terrorizes the area it inhabits as an always hungry dragon might.
A yrthak is blind. It senses sound and movement by means of a special organ on its long tongue. It emits powerfully focused beams of sound from the protrusion on its head. The creature is a yellowish-green color, with the wings and fin being more yellow and the head and body more green. The teeth are yellow.
Yrthaks are crafty and devious. They are omnivorous but prefer meat. An yrthak keeps a nest high in its isolated mountain lair and may travel for days in search of food, returning only infrequently. Yrthaks are sometimes seen swooping 100 feet or more above the ground, attempting to sense prey.
A yrthak is about 20 feet long, with a wingspan of 40 feet. It weighs about 5,000 pounds.
Despite their intelligence, yrthaks do not speak.
A yrthak prefers to attack from the air, strafing the ground with sonic attacks or snatching up and dropping prey (eventually landing to devour the flattened mess).
Sonic Lance (Su): Once every 2 rounds, a yrthak can focus sonic energy in a ray up to 60 feet long. This is a ranged touch attack that deals 6d6 points of damage to a single target.
Explosion (Su): A yrthak can fire its sonic lance at the ground, a large rock, a stone wall, or the like to create an explosion of shattered stone. This attack deals 2d6 points of piercing damage to all within 10 feet of the effect’s center. This counts as a use of the sonic lance attack and thus is usable only once every 2 rounds, and never on the round following a sonic lance attack.
Blindsight (Su): A yrthak can ascertain all foes within 120 feet. Beyond that range it is considered blinded. A yrthak whose sense of hearing is impaired is effectively blinded, treating all targets as having total concealment.
Immunities: Yrthaks have immunity to gaze attacks, visual effects, illusions, and other attack forms that rely on sight.
Skills: Yrthaks have a +4 racial bonus on Listen checks.
Source: Monster Manual (version 3.5), page 262. Removed duplicated text in the Blindsight entry that was repeated verbatim in the Immunities entry.