The Golden Door, The Test of the Guardians

After what felt like an eternity of swimming through the oppressive abyss, Stark finally reached a massive structure embedded into the cavern wall.

The sight was breathtaking: a colossal golden door towering over him, at least 50 meters tall and twice as wide.

Its surface shimmered faintly in the dim light, decorated with intricate engravings of battles long past.

Classifiers clashed with monstrous beings, their figures frozen in dramatic poses of struggle and triumph.

"...?"

Stark drifted closer, his sharp eyes scanning every detail.

At the center of the door were three circular indentations, their smooth surfaces gleaming like polished glass.

One of them glowed faintly, filled with a golden sphere.

[Defeat all Three Guardians to access the Boss!]

"So, that's the deal," Stark muttered, his voice low as he stared at the glowing indentation.

The orb seemed to pulse softly, its light almost alive.