the last arcane feat, and times for the one for level 20!

Arcane Master Variable actions Feat 20

General Skill
Prerequisites legendary in arcana

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You’ve master through study what only wizards know Once per day, you can choose an arcane 3rd level spell that is not uncommmon and attempt a DC35 arcana check. If you succeed, you cast the spell using as many actions as that spell normally takes. You use either your Charisma or Intelligence as the spell casting ability and are considered legendary proficiency to determine spell casting attack or save DC.

Thoughts?