He is Level 30. Thank you.
Cake's a nasty one because he can't be frozen, you can't steal from him, he can boost his stats and heal, he blocks a lot of icons and he can curse you to only use one weapon. He's really only for tier 12 and 13, and along with Menecuda he's the hardest BQ opponent by quite a distance.
Efferd's right about his icons and the best weapons to use against him. Focus on healing and blocking scrolls to help you survive longer. Otherwise all you can really do is keep training until you have the raw stats to take him down, he's an endgame opponent.
I don't know, I'm afraid - my main battler was capped when those two were added to BQs and can beat both of them easily, and my secondary can't beat either of them yet since he's still tier 11.
My tier 13 pet Magentawhimsy can regularly beat Menacunda but can only beat Biting Cake twice. Her stats are at 8100 even, and she hsa 204 AP.
I use exactly those weapons in post 2 and lots and lots of Cobalt Eternals and Sanctuaria Exodins.
It's been a long time since I tried to defeat Biting Cake, so I don't remember which weapons I used. My tier 13 pet doesn't have even stats (10k health, 8k strength, 6k defense, 4k speed) but managed to beat it 10 times. What I do remember is that I took as many void scrolls as possible (I think I only own 2, lol), and used those when both weapons were blocked. Maybe I also used Spacial Abyss.