After fully recovering from the ritual, you remove the bandages to reveal the results. Your arm has a monstrous appearance, has scars on it and 10 bright red eyes emerge from its skin. Each eye counts as a charge. You can expend a number of charges to cast the following spells without expending a spell slot:
1 charge - Mirror image
1 charge - Phantasmal force 2nd level
2 charges - Major image 3rd level
2 charges - Invisibility 2nd level
3 charges - Phantasmal killer 4th level
5 charges - Mental prison 6th level
7 charges - Illusory dragon 8th level
To cast each of these spells you must have the corresponding spell slot, but you dont need material components. You abide by the concentration rules normally. While the eyes are not covered, you have advantage on initiative rolls and you cant be surprised. If the eyes are covered in bandages, the arm regains 1d4 charges on a long rest.
Notes: Bonus: Spell Save DC, After performing the ritual, your hit points maximum are reduced by 4 per character level, your movement speed is 5 and you are paralyzed for 2d6 days. Each day spent laying in bed doing nothing reduces this time by 1 day.
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