I am DMing Lost Mines of Phandelver, and it's looking like the party wants to keep the cave as a base to replace the BBEG and turn evil.

Main question is: if I decide to let them fix up the forge of spells after a few quests for parts, what level / how challenging should this be?

I love the rule of unintended consequences, but am not sure of any down sides.

They let Sildar fail his death saves and bleed out while writing a letter of recommendation for a bugbear. So, yeah, evil.

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    \$\begingroup\$ Hi, welcome to the RPG Stack Exchange. Unfortunately, idea-generation questions are a pretty poor fit for our format here. The Stack works best with questions that have a definite answer...either based on personal experience, an understanding of the rules, etc. If you have a specific problem you're trying to solve, this is a great place for it...but if you need help coming up with ideas, perhaps a forum or Reddit would be a better place. \$\endgroup\$ – guildsbounty Dec 31 '18 at 18:18