Biomass

Biomass is a vital substance for the main creature's health and can be found in living beings, mostly humans. As the game progresses, the creature will encounter various dangers that will harm it and the need of biomass is primordial for the sake of survival, but also important for evolving and maxing-out some Skills.

Appearance
In-game, the Biomass takes the form of 5 greenish, long octagonal shapes and represents the monster's "health bar". When the creature escape it's containment, it will have only one health bar and must feed on human flesh to gain more health/bars. An empty bar's appearance is similar to a filled bar, only much darker.

As the game progresses, the creature can gain Skills that can upgrade it's Biomass limits, gaining 5 additional bars taking an orange colored hue after gaining the Xiphorrhea skill. Much later, 5 colored red bars can be added upon receiving the Harpagorrhea skill.

Mechanics & Functions
After consuming a human, the creature will gain more physical mass (nearly twice it's previous size) and can spawn more tendrils for it's locomotion (when climbing, walking, running or leaping), while gaining one additional green bar in it's health. After consuming another human, it gain even more physical mass and it's overall appearance drastically changes, also gaining a 3rd green bar. While gaining a 4th bar doesn't change it's physical appearance much, it will spawn more tendrils. It's only upon the final bar when the monster's appearance is humongous and barely recognizable from it's initial form.

When the creature is attacked by enemies, it will lose health and thus it's mass diminishes greatly to the point it will revert back to it's very first, small form. The Biomass lost when the monster is attacked can be easily seen into the forms of "red tendrils/worms" crawling away very fast.

Important note: to fully gain health and mass, the creature needs to eat the victim entirely. If it only eats one half of a human body, the creature's health will not change nor it's mass and must consume all the body's pieces in order to gain health/mass.