Not sure if I submitted this before or not but here goes.
Basilisk venom is corrosive, often killing them by melting/dissolving organs before they poison can. For parseltongues it's different, it dissolves their magic, and any magic cast upon them.
When Harry is bitten in the Chamber, the venom begins to dissolve his magic, including Dumbledore's core bindings, and the spells placed upon him. Sensing a student in danger, the castle pulls heavily from the leylines below. That power passes straight through Harry, bathing him in raw Eldritch power and burning the poison from him.
Now free of bindings and undue influence, his magic super charged by the castle, Harry is free for the first time in his life. Now, what will he do with it?














