Well, I got Midboss, Mao and Flonne caught up with Adell. I've been power-training Flonne's healing capabilities and atm she can dish out about 55 million damage in one cast, but her equipment is severely under-quality. Since item duping was made much more difficult, I'll have to resort to giving her a fist weapon to boost her base stats by around 3000% (for Adell, other aptitudes considered, this increased his attack power stat from 200,000 to 4,500,000; with a little persistence I can achieve a similar or better result with Flonne's RES stat).
Unfortunately, Healing Magic's gimped for isolated damage and it's going to be tough to get Flonne into the billions.
Unfortunately, Healing Magic's gimped for isolated damage and it's going to be tough to get Flonne into the billions.