(Beyond The Tower, Prerequisite: Irregular)

Your connection to mana is abnormal; brimming with an overwhelming abundance of magical energy. Power flows through you endlessly. You gain the following benefits:

Ability Score Increase. Increase your Intelligence, Charisma, or Wisdom by 1, to a maximum of 20

Dense Mana. Your connection to mana refines your magic to its highest potential. When you cast a spell, you can choose to extend its range by 60 feet, double its duration (if at least 1 minute), or maximize one damage die. You can use this feature a number of times equal to your proficiency bonus, regaining all uses after a long rest. 

Limitless. Once per long rest, when you cast a spell, you can choose not to expend a spell slot to cast it.

Blessed by Mana. You have a +5 bonus to any ability check or saving throw made to resist, contest, or manipulate mana-based effects.