Hi! 😀
Putting SA on A grade won’t even be the frustrating part, trust me. Wait till you decide to craft S grade weapons and getting AA for S SA is where it gets beyond super fun. 🙂 So yeah, lots of Catacomb farming ahead for you. 🙂 Especially if you are playing a mage character and decide to craft Dusk weapon … 10kk AA needed. 🙂 While you only need 2,5kk for A SA.
It is not that you do not understand, it is that you do not even question.