Should be good when the unit spawns in the castle and wait like in Epic War 3,if it is gonna be a epic war 5 then it should be a spell called Rush that make one unit spawns faster. + if u want to see the developers can see
@btrotta yes it is.u need alla meele units and the 3 fastest hero. Rush to the casstle when u have 106 mana use shield.The meele units will stay on foot so the mege pixel yeti cant attack the hope its help u =)
you could have done the 4th challengein a better way: load all your heroes (Viegraf, Kara, and a 3rd of your choice, I use Cassandra) with melee units lvl5, attack immediately, and once your mana gets to 106, cast the shield (also lvl5). this alone should let you complete the level, since the boss can't hit units close to him, and the beasts shouldn't be able to kill all your units before the castle goes down.
you can cast other spells after the first shield, but they shouldn't be necessary.