So Chapter 4, 22. Void Dragon Sea, level title "Ruler of Northern Seas", the last boss hit me for, if I recall correctly, 66k damage, and with the best team I can form, I have, maybe... 12k hp? I was able to defeat the Wood Dragon Seas' final boss that did 22k damage by using my Warrior Princess (that I got on my first gem draw, luckily) and a friend's Warrior Princess, using each of their nature-damage-preventing abilities every 10 turns, but now I'm facing a new behemoth that hits for 66k and I don't have any creatures of my own that prevent dark damage.
So, my question is: Is there a way past this level without an additional creature to block dark attacks? I have ones on my friend list but the CD is 20 turns and I can only take 1 (obviously). Are there any farm'able creatures out there that I can get without having to rely on getting lucky with gem recruits? I barely have enough disposable income to buy any gems at all, and God knows I don't have money to spam recruits until I pick up a Cyborg of my own.