The Brilliant Void Trophy in Bloodstained: Curse of the Moon

Story related and cannot be missed.

You must beat the third stage, The Brilliant Void.

Near the end of the stage you’ll find the upgrade item, which increases your overall health.
 

The boss of this stage is a floating money monster named Valefor. Its weakness is its head. The two hands will push mounds of gold from one side to the other you can attack and climb on so you can reach its head. It will also pound the ground when the two hands clasp each other and track you, followed by summoning monsters on either side.
 

The desperation move on this boss is a bunch of gold falling from the ceiling. There is an open area near the center that will gradually move right and left, so stay in the safe zone and you’ll be fine. When the screen goes all white, you’re good.
 

At the end of this stage, you have the option of recruiting, leaving or sacrificing Gebel.

Recruit Gebel as part of Those Left Behind
Kill him as part of Emperor of Darkness
Ignore him and move right as part of Nightmare's End