Simply bring any Epic tool to the forge and select which one you'd like to upgrade, costing three Rift Crystals each. After upgrading, you'll notice that the tool isn't legendary yet; you've still ...

By using those 10 supplies we just made, you can now upgrade Sola's Forge from level 1 to level 2, allowing Brynn to upgrade her equipment to level 2. You will, of course, be able to unlock ...