As the title says. I'm a DM in two campaigns, and I have clever, creative players.

There's nothing worse than them coming up with a clever use of a spell, and then... "No, it just chooses to succeed."

The way it just shuts them down. I really, actively dislike that. I want to reward my players for their ingenuity, not shut them down.

So I developed a similar feature, that allows for a greater chance of success, but is less "NO" at the players.

It's called Legendary Magic Reduction
Whenever a spell is cast within 100 feet of the creature, or a magical effect is used, that would force the creature to make a saving throw, the DC of the saving throw it has to make is reduced by X.

(X = proficiency bonus of the creature with this feature)

So failing a save is harder (plus legendary creatures usually also have magic resistance) but there's still a chance to fail. I have found that it plays a lot better, and scales well by the creature.

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Bonus story:
Today, I had a homebrewed multi-stage ice elemental boss, with LMR and Magic Resistance. The party's bard cast polymorph. The boss rolled double 2s, so even with saving throw proficiency, FAILED, and hard.

She had it turned into a sea cucumber, and then had another party member fly up and drop it from as high up as possible.

Better story.