In Solomon's Mines you will see several gates with mirrors locked behind them. These gates can ONLY be opened with the green scarabs found in the Emerald Nest.
You MUST complete the ENTIRE Emerald Nest location in order to retrieve ALL green scarabs necessary to open the gates! Be mindful, that some scarabs are behind a wall tile.
If you find yourself stuck in Solomon's Mines without enough green scarabs, please revisit the Emerald Nest to receive the needed scarabs. There ARE more than enough scarabs to open the gates.
Emerald Nest: https://youtu.be/MHLsHyKI_GI
Solomon's Mines: https://youtu.be/UfWu7Gh98O8
1ST FLOOR MIRROR SOLUTION:
2ND FLOOR SOLUTION
FINAL MIRROR SOLUTION: