I had in mind Jagen and Peri because they both have a rather easy access to Hone and Fortify Cavalry buffs. With an optimal set, buffed Jagen could reach 50 resistance on defense turns.
The problem is easily fixed with the HP+3 seal. With 40 HP, a vast majority of the relevant mages would have at least 3 less HP than Jagen. (Linde, Mae, Nino, Ursula, S!Lucina, Soren, Delthea, Sonya, Sanaki, Olwen, Katarina, and so on...) and even without water boost, Jagen can reach 44 resistance buffed, which is still insane magic bulk.
Oh, also, I never said those two in particular would be high/top tier units with this set or anything. They just do Berkut's job better (with his base kit, he seems to try to be a magic tank)
With the same idea in mind, Florina could also be a great option. She has access to +6 buffs, 42 base hp, and 34 base res.
