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The Evolution Cycle.

Each Host begins by choosing a power from the four available; this is a given. How they evolve from there, however, is slightly more complicated.

To evolve, a Host must spend GP (Growth Points.) A Host gains GP by consuming an enemy Agent or Host-Agent. Host-Agents are worth two GP, whereas Agents are worth one.

A Host can spend one GP in order to upgrade their starter ability, making it stronger, more efficient, etc. They may also save their GP, storing it up to use later. After spending one point to upgrade their starter ability, the cost rises to two GP, then three after the next upgrade, and so on.

The first evolution is a passive increase in the Hosts' physical capabilities: higher strength, greater speed, longer-lasting stamina, and the like. This evolution costs two GP from the starter ability, then three GP to enhance after that.

From here, the evolutionary tree splits. A Host may spend four GP to learn a Level 2 ability, which costs another four GP to upgrade.

A Level 2 ability evolves directly into a corresponding Level 3 ability, which costs six GP to evolve into and six GP to upgrade. However, a Host may also spend seven GP to cross over the evolutionary tree to the opposite Level 3 ability, which also costs seven GP to upgrade.

While Level 3, a Host may spend eight GP to learn the opposite Level 3 evolutionary ability.

Look, there's even a poorly-made MSPaint diagram!

The Knifehands Tree.

Knifehands - The Host can use their viral power to restructure their own arms into blades. These blades are not projectile. The razor-edged weapons are harder than steel and can cut through anything of a lesser density with ease.

No other evolutions discovered yet.

The Quillbody Tree.

Quillbody - The Host creates viral spikes all over their own body, making a versatile offense/defense mix. The spines are half a centimeter in diameter and are not easily crushed from any angle. They can be removed and thrown, with minimal damage to the Host.

No other evolutions discovered yet.

Passive Abilities.

Each Host gains several passive abilities from their virus; that is to say, abilities that are always active. They are things like:

- Enhanced strength. A Host generally has about double their regular strength upon awakening. They also find it easier to move faster. These boosts make them better, but no superhumanly so.

- Senses boost. A Host's senses are raised to a new level, though still not beyond belief. In addition, a Host can sense the presence of the virus in another being, granting them a sort of sense to find other Hosts. Both the senses boost and enhanced strength are on a lower level than those of the Eves.

- Healing. Unlike the Eves, Hosts are able to heal at a highly advanced rate. A bullet wound would be healed within a day. All Hosts are able to heal quickly. Sleeping is the fastest method for doing so. Healing also includes a high resistance, if not immunity, to most every disease or virus discovered. Narcotics, anesthesia, and other substances have a similarly weakened effect, to the point of almost none.


Boost.

The first ability that a Host can learn on the Evolutionary Tree, Boost further raises the strength and senses of a Host. Though it must be learned and is not started with, Boost raises the Host to a level above that of the Eves' average level.

A Host's strength will increase to triple and even quadruple their initial human strength, and their senses will become optimized. Their healing remains the same.