scratch that. this will go for most of the big bosses.
my team for the iron fortress:
vigraff max omega seal, paladin max platinum sword, elf hunter max dark rune, centaurion max fire rune, gorilla max poison rune, succubus 7/9 upgrades platinum sword, white tiger max lightning rune.
to beat that crazy juggernaut+golems+goblin rangers, worry about the goblins before the machine cause it will kick your ___ and it takes a long time to beat. when you do fight it, send every unit out and use sheild spells one after another as soon as it fades.
I used vigraff, but obviously watch out and make sure he lives so send him out with shield spell. if ur lucky, vigraff sneaks past the machine and u can buy alittle more time. hope it helps
dam that fallen angel trial was easy. the fact how it moves forward to attack and back is the main idea. get white tiger and the hero right up in its face and if ur lucky, they can run right past it and u can give urself a bit more time to kill the angel. and its also a little funny. but ul also need to keep healing the units and raise ur defense :)
should be like 3 and 4 where u have to destroy the base and not the hero. also having multiple heroes would help. and more units able to summon would be nice. and more enemies
in the first world, focus on upgrading the cat. by 1 and by barracks. then in the battle. only send like 2 or 3 soldiers out and wait til they lvl up. but u gotta back them up too and u should get a perfect wall