As a result of being the target of extensive, powerful magic you gain advantage against all spells. You attain this feat by being affected by and overcoming spells higher level than your character level (To your DM's discretion.) This feat is only accessible to characters that do not use and have not used spells. Similar to an actual callus the feat should only be awarded because of extremely powerful spells. The standard for achieving this feat is from spells 5 levels higher than your character level but, once again, is up to your DM.
If you use a spell anytime after gaining 'Magical Callus' the spell will tear off the Callus and you will lose it's effects. There is no way to re-achieve this feat after it's loss.
If a spell is positive for your character then you are given disadvantage instead.
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