can anyone tell me how to beat 3 sealed demons, bomb that deal 15k only deal like 1/8th of his life
Sorry if I'm late, but maybe this will be helpful:
First two bosses needs preparations before battle:
"Dummy Balloon" Item, "Moon Curtain 1 & 2"(Can stack with each other), "Shrine Jewel" will be a huge help for it's Counter chance rate, High Level(you need more HP, ESPECIALLY for 2nd one, Cockatrice-grind will help here), Best defence/resistance ammunition(My Build was: Shining Star, Gold Lion Armor, Shrine Jewel, Dummy Balloon and Brave Spirit Gem, I also had all Spirit-Skills(Dragon-Grind is best here, I guess)), auto-Hp/Tp regen, and Many Full-Health potions.
Knight(1st Floor) will regenerate 9K every turn, so best strategy would be to use both Moon Curtains and spam Small Explosives, he will die pretty quickly, and his attack is not as Strong as Next Demon ones.
Devil(9th Floor) is the Hardest One: He will Hit like Truck, so be sure to use both Moon Curtains, after that you will need at least 2,5K HP to be sure He will not kill you at next turn(He could easily kill me even with 2K HP in one Turn), I recommend both "Auto-Resurrection" as well, it is possible to stuck them with each other, Shrine Jewel will be Very helpful here: This Boss has a Lot of HP and you will have not so many opportunities to fight back, and you will need A LOT of Full-HP potions, at least, He can't regenerate, so Enough resources, temperance and determination will be enough to defeat This F**ker.
Death(11th Floor) is Easiest One(at least for me): He can't regenerate(but will Drain, so it would be nice to have drain resist items), you will have a plenty of opportunities to deal Damage to this Boss.