Eliza's Anesthesia

You make a willing creature literally can't feel pain. The target could cut their limbs and still feel noting.
If you cast this spell on a non-willing creature, the target must make a Wisdom saving throw. On a failed save, the spell effects kick into action. If the target's passive perception is higher than the caster's spell save, the target notices the effect immediately—otherwise, the target notice after a minute or after being obviously hit by something.

For the spell's duration, the target gets +10 to their concentration saving throw.

This spell doesn't make the target immune to magical pain like power word pain or similar effects.

"Now, calm down. This is going to sting a bit."