Seer

Seer
Not all wizards are satisfied with the mortal limits of power, honing their ethereal artes eternally with the knowledge of angels and demons alike. Known as Seers, these archmagi wield terrifying energies indiscriminately in their pursuit of ever greater power.

High Arcana
To a student of the arcane, even the simplest magics contain the seeds of true power. All that remains is to nurture them. Beginning at 8th level, your maximum castable spell level is treated as being one higher for the purpose of casting spells from a higher spell slot. You must still pay extra SP as normal to do so. Additionally, if you pay to increase a spell's level by at least 2 levels, it gains one bonus spell level, up to your maximum.

Grand Lore
To a Seer, power is power, no matter the source. Beginning at 13th level, you can add spells of 6th level or higher to your spellbook and prepare them normally, regardless of class restrictions. Additionally, when you escalate a spell of 5th level or lower to level six or higher, it does not count against your limit of 6th level or higher spells per day. The SP cost of such spells is unchanged.

Archmage
A seer at the pinnacle of their power is a force without equal - a vessel of pure power, and a master of the mightiest forces in the cosmos. Beginning at 18th level, at the end of each long or short rest, you gain two charges of Eldritch Might. By expending one charge of arcane might, you can cast a spell of 6th, 7th, or 8th level without counting it against your daily limit of 6th level or higher spells per day. By expending both charges, you can cast a spell of 9th level in this fasion. You must still pay the appropriate spell point costs.