Mechanics
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Umbral Scion (Ex)
Myrkdrekis have an exceptionally strong connection to the Plane of Shadows. From birth on, they can hide effortlessly in shadows, gaining Full Concealment when in an area that is not receiving full daylight or is under the effect of the Daylight spell.
By the time they reach Young Adult age, they master this ability and can turn their body into immaterial shadow and back as a Standard Action. They can also shift to the Plane of Shadow and back as a Standard Action. Both of these abilities also affect any person that is carried by the Myrkdreki, as long as it desires to do so. A creature that looses contact with the Myrkdreki while it is incorporeal becomes corporeal again, but a creature that was transported to the Plane of Shadows is not returned to it's original plane.
Ghost Bane (Su)
Before they learn how to become fully incorporeal themselves, young Myrkdrekis first learn how interact with and harm incorporeal creature. All natural attacks of a Juvenile or older Myrkdrekis are considered to have the Ghost Touch property.
Shadow Breath (Su)
As they grow older, the connection of a Myrkdrekis with the Plane of Shadows grows stronger, allowing them to manipulate it's energies ever more efficiently. An Old or older Myrkdrekis can infuse his breathweapon with living shadow, carrying the pain and wails of those lost in the eternal darkness with it. Creatures hit by this breath take 2d6 points of Strength drain and become blinded and deafened for 1d4 rounds. A successfull Will save negates the blindness and deafness, and reduces the Strength drain to 1d4 points. The Myrkdrekis can use this ability thrice per day.
Foreboding Whispers (Su)
As a Standard Action, a Very Old or older Myrkdrekis can infuse it's natural aura of menace with power it draws from the Plane of Shadows, causing everyone in range of it's Frightful Presence to hear ghostly, threatening whispers. Everyone affected by this ability becomes Panicked for a number of rounds equal to the Myrkdrekis Charisma modifier. On a successful Will save, the affected creature only becomes Shaken for one round. The Save DC is Charisma based. This is a mind-affecting fear effect. A creature who successfully saved against the Myrkdrekis Frightful Presence within the last 24 hours is still vulnerable to this ability, but gains +2 to it's save.
Energy Drain (Su)
By infusing it's claws and teeth with Negative Energy, a Wym or Great Wyrm Myrkdrekis can inflict one negative level per round to a creature it hits with them.
Maddening Whispers (Su)
Using much more power and focusing it more tightly, a Wyrm or Great Wyrm Myrkdrekis can focus it's fear aura to the point that it can overwhelm and shatter even the strongest minds. Thrice per day, the Myrkdrekis can create a 15 ft. burst, whose center must be within his Frightful Presence radius, in which each creature perceives an overwhelming onslaught of voices that promise nothing but death, ruin and madness. Each affected creature is dealt 2d6 Wisdom damage and it becomes Panicked for a number of rounds equal to the Myrkdrekis Charisma modifier. On a successful Will save, this is reduced to 1d4 Wisdom damage and being Shaken for 1 round. The Save DC is Charisma based. This is a mind-affecting fear effect.
Create Shadows (Su)
Having mastered it's own nature, a Great Wyrm Myrkdrekis has also learned how to twist the essence of other creatures to his whims. Any creature slain by it rises as a shadow (if 8
HD or less) or greater shadow (if above 8 HD) under Myrkdrekis control 1d4 rounds later, unless the Myrkdrekis does not wish to raise a given creature in this fashion.
Draconic Familiar
A mage with at least 9th level can take a Myrkdrekis Wyrmling as a Draconic Familiar.