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In order to spawn more Bricktrons, you need to acquire Wisps, also known as Souls and sometimes Fireflies. There are various ways to obtain Wisps, all described below.
Once there is a Yellow Wisp on your Home Crystal (that's the big one your Bricktrons began at), you can spawn it into a Bricktron by opening the radial menu on your Home Crystal (hold right-click on it) and
On all gamemodes, your Home Crystal will slowly generate Blue Wisps. It can also obtain Blue Wisps from other sources, mentioned below.
Once you have enough Blue Wisps at your Home Crystal, they will turn into a Yellow Wisp.
Yellow Wisps are Bricktrons that are waiting to be manually spawned by holding right-click on the Home Crystal and releasing over the type of Bricktron you'd like to spawn.
However! Smaller Yellow Wisps represent dead Bricktrons that are on cooldown and will automatically respawn after a little while. These can not be manually spawned at the Home Crystal.
Shards are smaller forms of Crystals scattered across the islands. If you capture a Shard, it will slowly generate Blue Wisps and send them to your Home Crystal. Remember! Once you have enough Blue Wisps at your Home Crystal, they will turn into a Yellow Wisp, which can be used to spawn a Bricktron.
In order to capture a Shard, you will need to send a military Bricktron (Knight or Archer) to stand next to it. However, on Sandbox, any Bricktron, even workers, can capture shards.
Corruptrons that are killed will also release Purple Wisps. These Wisps will slowly float towards the Home Crystal of the Bricktron that killed it. Purple Wisps behave as Blue Wisps - once you have enough at your Home Crystal, they will turn into a Yellow Wisp.