Purification Protocol

Purification Protocol is a PvE mode (Terran vs. Zerg vs. Protoss) in Stellars Horizon. It allows 1-4 players.

Players can choose from 8 starter planets, and develop their civilizations.

Zerg has similar behaviors in Swarm Scourge. A third-party force, called Protoss, will arrive in this sector and continue the war against Zerg.

Players need to defeat Purifier to win.

## Difficulties

* Zerg and Protoss will have unit-specified research and upgrades over time.
* Zerg will start to attack at 16 minutes mark.
 Hard
* Space is blockaded in the first 14 minutes.
* There will be one more primary invasion target, which is 2 in total.
* Zerg and Protoss will have unit-specified research and upgrades over time but at a much faster rate.
* Zerg drop pods contain 50% more army.
* Double the amount of Zerg and Protoss fleet units.
* Warping waves will warp in more forces.
* When a player enters Space Age, Zerg will send Behemoth to their planet.
 Brutal
* Before 16 minutes, if any player unit enters the space, Zerg will start to attack early. This includes upgrading to Orbital Command.
* Zerg and Protoss will have maximum research and upgrades in the beginning.
* In 8 minutes, Zerg will send Behemoth to all planets.
* Leviathans can destroy Space Barriers and Planet Shields instantly.

## Invasion Target

See the definition of invasion target in Invasion Target section in Swarm Scourge.

## Attack waves

The drop pods in the first 3 attack waves (not including the advance wave) are not interceptable. Space Barrier cannot stop them.

### #0 Advance wave

Advance wave only exists on hard and brutal.

Zerg will deploy Behemoth to the players who enter Space Age on hard.

Zerg will deploy Behemoth to all the players in 8 minutes on brutal.

### #1 First wave

Zerg will deploy drop pods to invasion targets only. There will be 1 drop pod to each secondary invasion target, and 2 drop pods to each primary invasion target.

### #2 Second wave

Zerg will deploy drop pods to every planet.

Protoss will set up a Transition Core and warp in forces to clear and occupy the unmanned secondary target.

Protoss will also set up a Transition Core and warp in forces to clear and occupy the unmanned primary target on Hard and Brutal.

### #3 Third wave (advance fleet)

Zerg will deploy drop pods to invasion targets only.

Zerg advance fleets will head towards invasion targets.

Protoss will start to purify Zerg planets to purify them. If there are no Zerg planets, Protoss will purify Terran planets.

### #4 Fourth wave (secondary fleet)

Zerg secondary fleets will attack invasion targets, then attack all planets. The number of fleet is based on the number of invasion targets.

### #5 Fifth wave (Zerg & Protoss main fleet fight)

Zerg and Protoss main fleet will arrive and head towards each other.

Protoss fleet units will be teleported to a Transition Core when they take critical damage and restore health over time. The Protoss fleet will eventually defeat the Zerg fleet.

After Zerg fleet is defeated, all the Protoss fleet will warp out of the battlefield, and Purifier will warp in at a Transition Core, and starts Purification.

## Purification

Purifier will purify all the non-Protoss planets. It will always choose the nearest one.

Purifier is invulnerable before all the Protoss Nexuses are destroyed or before all the non-Protoss planets are purified.

Purifier will move to the purification targets, and start charging Gravitational Distortion (on normal, only eliminate all the units on the planet)/ Planet Cracker (hard or btural, destroy the planet). It cannot be interrupted, even after the invulnerable shield is gone.

If Shadow Planet is the next purification target, it will be locked and cannot move.

## Benedictions

Benedictions are available in Purification Protocol mode.

Check out the benediction section.