へと向かう - what's with the と

太郎は亀の背中に乗って竜宮城へと向かったのです
Taro got on the turtle’s back and they headed towards the palace of the Sea Goddess.

女は悪魔の宴へと向かう。 She rides to the black sabbath.

So when one writes へと向かう instead of just へ向かう and what nuance does it add.

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