Spelleater

Inheriting their power from mages of old, the spelleater thrives off of stolen or borrowed power. Increasing their already powerful magical abilities by absorbing the very essence of other casters magic, to use against them. 

Vol Magique

At 1st level, Whenever a creature within 60ft of you  casts a spell, you may use your reaction to absorb some of the magical essence used to cast said spell using your sorcerer spell slots. For (½ Charisma Modifier, Minimum 1) Hours you have access to this spell or until this feature is used to store another spell, once cast the stored spell is lost. The spell that is stolen must be of a level that the sorcerer currently has access to spell slots for.

At 6th level you may spend (Spell level)+1 Sorcery points on use of stored spells to gain one additional use of said spell.

Charismatic Caster

At 6th level when casting a spell stolen with Vol Magique you may add your charisma modifier to one roll, even if by other means, it already has your modifier added.

Spell Stall

At 14th Whenever a creature within 30ft casts a spell that you have stored with your Vol Magique you may attempt to negate their spell cast, the creature must succeed on a Charisma saving throw against your spell DC, else their spell is negated. This feature can be used once and recovers on a short or long rest.

Grand Vol Magique

At 18th level when you absorb a spell with Vol Magique you learn it permanently.