Obtenebration is the trademark Discipline of clan Lasombra which is the unearthly control over shadows. It is related to the practice of Abyss Mysticism within the clan.
Associated Powers:
Level 1: Gain Control Shadows, this can be cast on yourself or on a target, coating the area around them in shadows that follow them as they move. Gain Shadow Eyes, an ability with several toggles to adjust from Off to increasingly brighter as shadow powers allow you to pierce through darkness - take care to not have this turned up too high if you want to see where the shadows you created through Control Shadows are.
Level 2: Pull a target towards you with a Shadow Tentacle, dealing 25 Burn damage. Having Grab intent selected will instantly pull them into an aggressive grab.
Level 3: Gain the ability to Summon Tentacles, turning both your hands into tentacles that deal decent Clone damage.
Level 4: Gain the ability to cast Shadow Armor, a powerful but temporary defensive buff.
Level 5: Gain the ability to cast Shadow Walk, causing your form to meld into shadow itself as you become completely incorporeal, allowing unfettered movement in darkness. Using Shadow Walk in front of a mirror will allow you to transport yourself to any other mirror. Gain access to Abyss Mysticism, a form of Blood Magic that requires a Mystic Tome.
Abyss Mysticism
By using the crafting menu at Obtenebration 5, you can make a Mystic Tome, assisting you in the usage of the Selfgib, Silent Heart, and Identification Runes.