Eldritch Tenacity (Augmancy: Eldritch Blast)

Augmancy. To cast this spell, you must know how to cast eldritch blast. You do not need to learn or prepare this spell to cast it if you know eldritch blast and have an appropriate spell slot available.

As part of the casting of this spell, you can cast eldritch blast. Each attack roll gains a bonus to hit equal to the spell slot level used.