Only Useable if you have a Heart of Dark, a Power of Dark is only obtainable at certain levels.
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Heartless control: allows the user to control heartless, they can also summon Heartless, but what heartless they can summon depends on the users level, a person with a higher level can take control of heartless you summon
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Guardian: The user releases there heart and creates a guardian a being of darkness that attacks with you and protects you no matter what, it is powerful and strong a hit from hit deals exactly the users level, but will leave the user badly damaged when destroyed
Example:

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Dark corridor: The user creates a Dark portal that allows them to travel between worlds
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Dark Spells: the user gains a dark version of an elemental #spells, theses spells deal increased damage to creatures and people of light, only one Dark Spell per power up .
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Dark power up levels:
Level 3: Dark Corridor gained
level 10: can pick one Dark Power from above
level:15: can pick one Dark Power from above
Level 17: can pick two Dark Powers from above
Level 21: can pick one Dark Power from above
Level 25: can pick two Dark Powers from above
Level 27: can pick one Dark Powers from above
Level 30: can pick three Dark Powers from above