Tower #1
Level 1, cost = 50 crystals, yield = 1.92%
Level 2, cost = 75 crystals, yield = 2.52%
Level 3, cost = 112 crystals, yield = 2.53%
Level 4, cost = 170 crystals, yield = 2.54%
Level 5, cost = 255 crystals, yield = 2.634%
Level 6, cost = 382 crystals, yield = 2.638%
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