He's waiting for death

Thick, dark clouds slowly sank downward, making it oppressively difficult to breathe.

Mike stood atop a small hill, slightly tilting his head back, silently stacking his [Charge Up] ability. 

The CD for Charge Up is 10 seconds, but with Stormweaver's 50% CD reduction, it stacks every 5 seconds. It takes 30 stacks to reach full power, which requires 150 seconds, or 2 and a half minutes.

The boss hidden behind the clouds didn't keep Mike waiting too long and soon revealed its true form. 

It was a humanoid creature, about 10 feet tall, with muscles coiled like dragons, exuding a strong sense of power that delivered a significant visual impact. 

Its wings flapped in the air behind it. The gray wings were long and sharp, each flap stirring up a whirlwind, creating a terrifying momentum.

In front of Mike appeared an angel with black feathers.