Sponsored Magic for review

[idirex]

Hi . I would like to submit a Sponsored Magic for review . I have had a lot of trouble with it and have made some drastic changes from its original concept .  This is Very similar to Hunger magic ( a rolled up sponsored magic and vampirism ). What I'm concerned the most is its cost and if I have missed something obvious . The Focus part is for "convenience and clarity" . Please comment .
Edit : Changed as per Belilal666 recommendation .

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Blessing of The Dark Sun [-5]
Description: You have earned the blessing of The Dark Sun .
Sponsor: The remnants of this ancient being are faded but It is an immortal after all . It deals in Power and its preferred currency is blood . All power granted to you must be employed in accordance with its agenda . Failure to do so will incur its wrath .
Agenda: Its agenda seems to be the destruction of supernatural predators and will aid you in your efforts to uphold it . Its sworn enemies are Necromancers . Its servitors are Fire Elementals and Shadows .
Evocation : In accordance with Its duality you have access to  Black-fire (active during day) and Shadow-heart (active during night) .
Black-fire : Black flames consume your enemies . ( Satisfies catch for Fire , mundane or magical )
Shadow-heart : Subtle and insidious powers (veils , mind magic and spirit manipulation) befuddle your foes . With enough skill , their minds are yours to command . ( Only mental attacks , or their equivalent , can be made with this power )
Thaumaturgy : Rituals cast by the power of this ancient being must uphold its agenda and nature .
Evothaum : By using your Power reserves , you can cast thaumaturgy with Evocation's speed and methods . Doing so , causes you to immediately take one hunger stress on top of the mental one . ( At the end of the scene you will suffer Feeding Failure equal to the number of spells you cast )
Spell Drinker : You are resistant to magic ( Armour : 1 against Magic )
Focus : All your focus items for evocation provide bonus for Black-fire , Shadow-heart , Evothaum . This power allows you to take additional Sponsored Magic at reduced cost . Their foci must be specific for each one .
Musts : Vampirism , Feeding dependency and Marked by Power

[Belial666]

1) Far too powerful for a single sponsored magic. I count 4 major benefits; Evothaumaturgy powered through feeding which basically doubles the amount of evocation you can cast in a scene, Spell Drinker which allows you to clear stress tracks and mild consequences each time you take out targets with magic meaning you basically have unlimited evocation as long as you use it offensively, the ability to assume additional "Marked by Power" versions, and the mechanical bonuses of armor vs magic and defense vs feeding.
Every singe one of those bonuses would about match the bonuses of any other sponsored magic. I'd never allow them all together. Some of them I'd never allow at all.

2) Do not integrate additional powers into the sponsored magic itself. Simply have your sponsored magic include "Marked by Power", "Feeding Dependency" and "Vampirism" into its "musts".

[idirex]

Now that you pointed it out it really is a cheat  . I shall do as you recommend .
If anyone else has further recommendations , please don't be shy .