What is sion's build league of legends?

As a bit of update, it is not viable to build Sion as an AP Carry after his rework (since the answer below implies to this). Now he is strictly a Tank that should be build with a bit of AD. Sion's new kit doesn't have the scalings he used to have, so AP Sion is pretty much destroyed.

He can either build AP (utilizing a combo of Cryptic Gaze and his exploding shield, which although wicked early-mid game, can hurt a lot late game as he is without an ultimate that is useful) or AD (utilizing a combo of Cryptic Gaze, his empowered axe and his ultimate with a support of his exploding shield).

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