Hollow Heart

Hollow Heart is a passive item in Vampire Survivors. It is unlocked by surviving 1 minute as any character.
Hollow Heart multiplies Max Health by 1.2 per level.
Hollow Heart is required for the evolution of Whip, Bloody Tear.
Hollow Heart can be found as a stage item in Mad Forest, Moongolow, and Boss Rash.
==Levels==
Hollow Heart has 5 levels. Each of them multiplies the current value of Max Health by 1.2.
Level	Description 	Effect total
1 	"Augment max health by 20%."	1.2x Max Health
2 	Max health increases by 20% 	1.44x Max Health
3 	Max health increases by 20% 	1.728x Max Health
4 	Max health increases by 20% 	2.0736x Max Health
5 	Max health increases by 20% 	2.48832x Max Health
==Tips==
*Hollow Heart's health bonus stacks multiplicatively. This means that each level will increase your Max Health by 20%. However, it multiplies your current total, not original total. Characters who gains a flat amount of Max Health later like Toastie will lose out on the benefits if it applies to its starting health instead of at level 100+.
*Hollow Heart does not heal you to fill up your newly increased Max Health.
==Trivia==
*The Hollow Heart is inspired by heart container from the Legend of Zelda series, or simply video games at large, increasing the cap of max health.