Build a huge horde of monsters and seize all the shelters from humans.

If the enemy proves too strong, fling giant monsters into battle.
Summon a countless zombie horde, or wake up the speedy witch
and have your enemies torn to shreds in a blink.
Now you can turn weak monsters into enormous giants right in the middle of a battle or imbue them with incredible strength and speed.

Combine a host of abilities with monsters and take over the entire FortressTD universe.