Hello, I bring you a video where you can watch the guide about Workshop, and spending 10 M on getting equipment and Mysterious Metal.
From my point of view:
1. Get some equipment without spending many blue crystals.
2. Refine only equipment you are going to use.
3. Level up inscriptions of your Heroes to the maximum (of those that you will use).
4. Once you have done these steps, you can spend about 10 M to get equipment.
Greetings and thank you
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