Ogham is only found among the fading Arhimanes bloodline, and they claim that one who does not share their curse cannot learn it. Since Ogham draws from the power of the dark forest spirit that touches each of them, it is quite possible that they are correct. The Lhiannan know that the spirit that empowers them is waning, growing weaker by the decade, but for now, at least, the power of the blood compensates. 
Using Ogham is avery personal experience, for the spirit that shapes the magic lies at the core of the Arhimanes. No Arhimanes uses Ogham casually. Another limitation of this power is that a Lhiannan’s use of it is linked to her home demesne. Those who pass more than50 miles from their territory must bid an additional Trait on all Ogham-related challenges.
Use Survival for retests of Ogham.
														

BASIC
CONSECRATE THE GROVE (1)
You can use your blood to awaken the forests to defend you by piercing your
  skin and sprinkling the blood in a widdershins (counterclockwise) spiral. The
  foliage in the area you consecrate will act in your defense, flailing at and tripping
  intruders.
Expend from one to three Blood Traits, taking one turn per Trait to anoint the
  forest as described. One Trait covers an area 10 feet in diameter, and each
  subsequent Trait doubles the diameter. For the remainder of the scene, any person
  within the consecrated area who acts against you must bid an additional Trait in
  any challenge to counteract the thrashing vegetation. Additionally, should you
  use Consemate the Grove in heavy woods, your enemies must win a Physical
Challenge or take one level of bashing damage per turn.

CRIMSON WOAD
By tracing ancient runes in blood across your body, you can invite spirits to
  gird you physically and spiritually for battle. Bound by an ancient pact, these spirits
  guide your Beast and fortify your mind and guide your hand in battle.
  
Spend one scene painting the runes on your body with one Blood Trait, then
  expend from one to three Mental Traits. While under this power, you suffer no
  penalties for being Bruised, and for each Mental Trait expended, you gain one
  bonus Trait for all Courage Tests and Mental or Social Challenges. Once per use of Crimson Woad, you can call upon the spirits to direct your attack, inflicting one
  additional level of damage per Mental Trait spent.
  
Crimson Woad lasts for one scene or until you take four levels of damage, in
  which case, the runes are considered wiped away and the spirits freed.

INTERMEDIAIRE
INSCRIBE THE CURSE
By painting the name of an enemy in ancient runes in blood on your body, you
  can bind spirits that will enact a curse upon your enemy when she sees it. You can
  shape the form of the curse by placing the name in different locations on your body.
  
Expend three Blood Traits, and write the name of your enemy upon the
  appropriate part of your body with them. The name must be painted in a visible
  location, but the enemy need not be able to comprehend it. As soon as she sees it,
  the enemy must win a Static Mental Challenge (difficulty seven Traits) or be
  affected by the curse. The curse lasts until the name is rubbed off or defaced if you
  suffer four or more levels of damage.
  - Body: Written on the arms, legs or torso, this is the curse ofweakness. Mortals
    must bid an extra Trait in all Physical Challenges, and Cainites cannot use blood
    in any way other than the single Trait necessary to stay active.
  
- Mind: Painted across the forehead, this curse disjoints the enemy’s mind. In any
    Mental Challenge, the enemy must expend a Willpower Trait or automatically relent.
  
- Voice: Painted on the throat, the enemy loses the power of speech. She may
    grunt, but she cannot form words.
  
- Soul: Written directly above the heart, the enemy is overwhelmed by primal
    feelings. Mortals must flee your domain and Cainites are two Traits down on tests
    to resist frenzy.

MOON AND SUN
  You can paint ancient glyphs of the celestial bodies upon yourself to invoke
  the aid of their spirits. Lunar spirits provide special gifts, while solar spirits ward off
  the worst effects of sunlight and fire.
  
It takes three Blood Traits and 15 minutes to inscribe one of these glyphs. The
  glyphs must be exposed, and they can be inscribed on any willing subject. A single
  person can benefit from both glyphs at the same time, but the power fades if the
  glyph is rubbed off or defaced by the bearer taking four or more levels of damage.
  
If you wear the sun glyph, you can expend a Willpower Trait any time you are
  exposed to fire or sunlight, converting one level of damage from aggravated to lethal.
  
If you wear the moon glyph, you are one Trait down in all tests to avoid frenzy,
  but you gain two bonus Traits on all other challenges.

ADVANCE
DRINK DRY THE EARTH
You can identify sites of power - cromlechs, faerie rings, dragon tracks and
  the like - and draw spiritual energy from them. Doing so can be dangerous, for
  wizards, faeries and Lupines also use these sites. Additionally, taking too much
  energy from these sites can leave them barren and lifeless, as if you have drained
  the lifeblood from the earth.
  
You must win a Static Mental Challenge - difficulty to be determined by the
  Storyteller - to discern whether a location can provide power. Once a suitable
  location has been discovered, you must expend a Blood Trait to mark the site and
  attune yourself to it. Thereafter, unless someone interferes with your attunement,
  you can drain the site’s mystical energy to yourself whenever you visit it, gaining
  two bonus Traits for every Road Trait you possess. These bonus Traits last until
  dawn, and they can be used in any challenges.