Invader

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The hostile Non-Player Characters (NPCs) of screeps. Their forces are built up of creeps, however instead of the user's round shape they take on a more angular one colored red. They have a body the same as a normal creep made up of the same parts. They are immediately hostile to any user's creeps but will only attack/peruse in the room they were created, they will not pass exit-tiles to peruse a creep. They come in several forms.


Stranded Room Invader

The most common Invader a user will encounter, when harvesting energy in a room with creeps an counter is being tallied of total energy harvested. Once the counter has been reached an invasion will be attempted. The invaders will attempt to spawn on an exit tile, invaders may only spawn on exit tiles from neutral rooms, meaning that no reservation or claim can be on the room that their exit tile the spawn on is connected to. If there is no viable exit tile, they will not spawn. Invasions can happen in any room where energy harvesting from a source is happening, claimed, reserved and, SK rooms alike.

Once spawned, the invader will then make its way to attack the user's creeps. It will avoid attacking structures unless it is blocking its access to the user's spawn.

The invader(s) will not stop attacking until:

  • They die of natural causes (their TicksToLive, 1500, reaches 0)
  • They succeed in killing all the user's creeps in a room and can reach the spawn.
  • Their HP is brought to 0 by the user's creeps or towers.

Their body makeup and numbers varies on the room's controller level, if there is no controller they tend to spawn lager bodies and more numerous. Claimed rooms do also have low chance of spawning a large more powerful group then would normally be seen.


Source-Keepers

Source keepers are special invaders found in Source-Keeper rooms towards the center of a sector. They spawn from eternally from keeper-lairs, the process begins as soon as the creep hits low HP or dies of natural causes.

Each source-keeper seeks out and defends the nearest source or mineral from its spawn location and defends it. Unlike regular invaders, they will not chase a user's creeps but instead will attack anything in range and stay to guard the source.

Strongholds & Stronghold Invaders

Strongholds are Invader bases that periodically spawn in an Source-keeper room in a sector. Only one can be spawned at a time, and they vary in level 1 - 5. While they are quite a challenge to take down, they contain many valuable resources.

Invader Core

The primary core of an invader base, it acts as a spawn & brain for invaders stationed at the base. If the core dies, any invaders created by the base stop functioning and no invasions can happen in the sector for a limited time.

The stronghold will also spawn proxy invader cores which will attempt to reserved the controller of the room they are spawned in, causing problems for harvesting in that room.