While most spellcasters spend their time studying how to unleash ever more potent magics, you have instead dedicated yourself to the art of re-absorbing fractions of your magic to prevent it from unleashing its full potential upon the world.
Perhaps the patron that empowers your magic has forbidden you from using it to kill, or perhaps you are an elite bounty hunter renown for your skill in subduing the most dangerous of targets whose capture brings far greater rewards than their corpse. Regardless of the reason you have mastered the art using your magic to subdue your opponents rather than kill them.
However in order to achieve this extremely precise feat you actually need to redirect the excess magic back into your own body before it can trigger its effect upon the world, after which you attempt to safely dissipate the excess energy instead. This is a far more advanced process than the more common task of holding a spell at the very cusp of its casting (as every novice spellcaster can be taught to do), for in this situation the energy of the spell has already been unleashed upon the world and will not meekly comply with your attempts to restrain it.
Before you roll damage for any spell under your control you may expend one use of this feat to declare that damage as "non-lethal", in which case any creature (except for you and any creature you are currently magically sharing damage with in any way) that is reduced to zero hit points by that damage is instead knocked unconscious and is stable instead of killed. You must then take damage equal to the total of any and all excess damage inflicted on any creature knocked unconscious by that damage, minus your current character level (min zero).
This feedback damage is of the same type as inflicted by the spell. If multiple types of damage occurred simultaneously then calculate the ratio of the damage inflicted upon each individual creature to determine the ratio of the feedback damage types you receive from that creature (ie. apply any type affinities for the affected creatures before calculating the feedback ratio, and apply any type affinities you might possess after) .
Once the feedback damage has been calculated the spell is ended (with no further spell effects applied other than any explicit reversions to previous states).
You must still expend a usage of this feat even if no excess damage was inflicted and/or no feedback damage was received. You may not stack additional uses of the feat on the same damage roll so you may only apply one level reduction per total regardless of how many creatures were impacted (obviously the greater the impact of the spell the harder it will be for you to dissipate the excess). Be warned! Interfering with the primal forces of magic like this is extremely risky and even the most skilled practitioners of this art place themselves at direct risk of being overwhelmed (or even killed) should they attempt to temper a spell they released with too much force for their mere mortal vessel to re-cage!
You may use this feature a number of times equal to your spellcasting modifier + your proficiency bonus. You regain all expended uses when you finish a long rest.
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