The Clockwork Golem

This could be a new mid-game boss in the trial chambers which could be found in a new, rare large chamber. It would be essentially an artificial golem made out of copper and you can see gears in its body, it would have 75 hearts.

A player can start the fight by using a trial key on the deactivated golem, its eyes would light up and it's gears will start moving. It has 2 attacks: the first is using its huge fist on its arm to deal blows which can take out 5 hearts of an unarmoured player. Its other attack is to use its other arm, which is a cannon to shoot out breeze wind charges, though this attack has a short cool-down.

Upon defeat it will drop loot, some of it can be found nowhere else. Mojang, please discuss this idea!