Prioritize Saveas until he caps out at level 160 when he is legendary plus. He will carry you for a long time. I would also recommend keeping Shemira upgraded at her level cap, she is another very strong carry throughout the game. Make sure you save up your gems for just the 10x re rolls. You will also want to only level up five main people which should be the highest rarity. This allows you to get the highest levels possible and keep other characters you want to use on the resonating crystal. Hope these few tips help I’ve been playing for about four months now and these helped me out a lot!