A Sword Without a Hilt: A Song of Ice and Fire/D&D 3.5 Crossover
In a world where magic has all but guttered to ashes, becoming the fare of charlatans, petty conjurers, and ragged illusionists, a mighty change is stirring. From small and fragile sparks a great blaze will be reborn and men will again look in wonder awe and terror at those who would dare to call on secret powers. Heroes and fiends, champions and monsters, soon all will walk under the light of common day once more.
It isn't every day that one acquires superpowers. Or siblings. Or superpowered siblings. Honestly, your mother would probably prefer it if you stopped adopting people without asking her first. But adopting threats to humanity is better than being one, isn't it?