To finish the last CoT5 u need to use fast spawning units and are also fast. I used goblins, phantom, dwarf engineer, fire succubus, mermaid and centaur and for spells i used comet, rain of arrows, Athena, Hercules, lightning bolt and phoenix strike. In CoT5 the com only uses goblins and bomber but one of the goblins is invincible.
This game is two easy. Tip for any1 who are having trouble completing any lvls just have enough power to stop creep advancing at all then slowly push ur way through. Last lvl u just need to move the city to the center of the hill.
if any1 need help on the last one. Best advice move the city in to the center of the hill and get the tech quickly and build blaster to keep blaster flooding the center. and build drones to stop the flooding over the hill. and eventually use all the land behind for power by covering it with collecters and reactors.