You have gained possession of a Holy Grail, one of the most sought-after artifacts in mage society. A Holy Grail is essentially a condensed mass of pure magical energy that can react to the wishes of its holder to grant them their wishes.
Besides wish granting the Grail can also serve as a powerful magical battery with limitless capacity capable of being the catalyst for powerful spells and rituals or enhance its wielder magic to a great extent. Your Grail has a small connection to The Root which allows it to recharge in the case where you exhausted its power, or continue to accumulate more and more magical power over time.
When exhausted it will take a month for the Grail to retain its original potency. You could also store your excess magical power by placing it within the Grail. Your Grail starts off at the same level as the Art Graph Holy Grails' present in the Solomon 7 singularity.