Last session, I allowed a spell from Xanathar's that seems overpowered. While I tend to be a DM who likes to say yes to his players, I can detect that this one will upset the balance of the game. (I didn't do my due diligence and research that the spell has an OP reputation before the game, because I tend to err on the side of allowing official, published content.)
How do other DM's deal with these situations? Forbid the spell? Make changes to the spell to bring the power level to a reasonable level? increase the difficulty of encounters?
How do other DM's deal with these situations? Forbid the spell? Make changes to the spell to bring the power level to a reasonable level? increase the difficulty of encounters?