As it says, I'll go first: Back to the Storyline please, it was annoying to find a new land. Arrow Towers back, getting the towers back can be really good to defend yourself. Buildable buildings during fights - Building a second tower that shoots where you want it to, maybe automatic Archers. Different types of soldiers - if you are bringing back Elves, Orcs and Humans try to bring Assassins, Wizards, Dryads, Wolf-Riders, Paladins and the like back, while some others from Epic War 3 could be used too, the Black Knight, for example.
Yeah, Epic War 3 is very eassy... You just have to have those things that use flames to make enemies go in the air, then attack. THEN you have those comets/whatever to kill everything you want. It's way too easy.
Yup, 3 titans - 1 lord of shadow, 2 ice titans, and more on the revenge wave. And the invincible goblin is nearly invisible, has infinite life and deals 9999 damage with each hit.
It's difficult, but not impossible, hints: DO NOT Comet the defense Structure of the enemy Castle, doing so will aggro the Goblin Assassin and would quickly mean forfeit. Attack with full ranged units and goblins, because the Ranged can suppress enemies and the Invisible Assassin, while the Goblins are at the front lines. Don't bother with titans, it would do nothing for you. Don't attack in groups, this Assassin can take 3, maybe even more enemies at a time, do not engage with an army of melee soldiers. His only way of death is the destruction of the Castle, make the attack swift and decisive.