Defender spawner blocks
The only craftable blocks in Castle Defenders are the defender spawner blocks. They generate defenders. You can put them home, so they protect it from enemies. You can find them too in some mercenary buildings.
You can pick them with a pickaxe.
Blocks for level 2 units looks like the level 1 ones, adding a diamond.
Level 1 units:
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| Knight spawner | Archer spawner | Mage spawner |
Level 2 units:
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| Knight – Level 2 spawner | Archer – Level 2 spawner |