This hextile is unlocked by completing field O6.

Its first field, R1, is the tome chamber for Critical Hit (Yellow). Beating R1 opens up R2, R3 and R4 which are normal levels. Beating R2 opens up R5, which has a lot of mana shards.

When I first reached R4, it was notable for having every color of gem available. (Circ)

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