You have studied and toiled over your magics to the point of mastery you gain the following benefits. You gain a pool of Mastery points 6 points that reset after a short rest with said points you may spend them doing the following:
Magic of mind defense 1 point: When concentrating on a spell and are struck by attack you may use a point to allow you to ignore the Constitution saving throw to maintain your spell.
Magic of spell ending 1 point: when you are hit by a spell that has affects that last after the first hit (Ex The slowed condition) you may use a point and a reaction to end the affect.
Magic of magic copy 2 points: When a spell caster casts a spell in sight of you that you don't currently have prepared but do know you may use 2 points to cast that spell.
Magic of Casting stopping 3 points: when a caster is in 25 feet of you may use a action and three points to stop there spell casting for two turns to avoid this they need to make a (DC 10+ spell attack bonus) con save
Magic of spell longevity 4 points: when you cast a spell you may use a bonus action and 4 points to double the time a spell lasts.
"A true master all ways has tricks up there selves!" -Erlek the Thunder weaver