How do you get the Prismatic Shard in Stardew Valley?

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Tags

1. #wilderness
2. #stardew
3. #shards
4. #reached
5. #bottom
6. #skull
7. #mummy
8. #onward
9. #golem
10. #prismatic
11. #shard
12. #iridium
13. #eventually
14. #nodes
15. #serpent
16. #valley
17. #while
18. #mines
19. #pressing
20. #mining
21. #geodes
22. #cavern