I recently just ran the "10x level 15" Fire Knight, It was a breeze, Cardiel is a god in there (Coldheart/Crusader/Kyoku/Apothecary). I'm pretty sure i can switch out Crusader for higher levels and pick a positive affinity champ out of what i got, and run it to 20.
I currently do spider 16, but again, just got Cardiel, havent gone in there since i got him. Bringing both Deliana and Dreng to 60 will help me in various stages to clear up to level 20, pretty sure.
Dragon and Ice Golem 20 are no problem.
I can do most of the keeps at level 20, so those are not problem at only level 15
Clan boss, i do anywhere between 16m and 24m per run in Nightmare. I havent booked up Cardiel yet, waiting to score some points in next CVC. That should help reduce the downtime with no revive, where i lose some champs around round 18-20 if his buffs run out. I got a key saved up from recall quests. so the 100m mark using a 5th key is really doable.
Arena, i'm cruising. I'm 150 medals away from level 9, in gold 5. I get 25+ wins each day, depends on how many of the free recharged runs i can do
So really, this magic champion is my only dilemma
I was really "hoping" Hope would be the answer, she's the only debuffer in my roster aside from Warcaster. on paper she looks to fill some need, but is she that bad?