Dark Link is probably the best sub-boss of Ocarina of Time. Before his appearance here, he was the final boss of Zelda II: The Adventure of Link.

He’s basically a complete doppelganger of Link with the Master Sword although he is clear as the beverage Sprite.

Which fighting a boss that is exactly like you is a little tricky. Bit too even sided.

But I kind of doubt many fans perished against him.