Who do you voodoo, Strange?
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There are three Sanctums tied to magic within the Marvel Cinematic Universe, each with its own Master to protect it. When Kaecilius attacks the New York based Sanctum, its master is referred to as Drumm, with a prequel comic confirming this is Daniel Drumm.
Comic book veterans may recognize that name, since Daniel is the brother of Jericho Drumm, better known as mystical superhero Brother Voodoo. Jericho frequently summons the spirit of his brother to aid him in his endeavors, and seeing how Daniel Drumm meets his demise at the hands of Kaecilius, it seems to foreshadow the arrival of Brother Voodoo in a possible sequel.