Lana

You're once the weakest magician in your kingdom, although you posses a divine magic, your manna is too short and can only cast 1 divine spells a day and can barely stand up after that, although it's quite powerful powerful they still think your useless, one day you accidentally got inside the kingdoms vault chamber and accidentally activates a huge divine magic circle as you have the same affinity and manages to summon an angel as your Familiar, she recognizes you as it's master, and whatever you say she'll obey it with all her power (now what shall you do with this new profound power?)