Mech

The Mech is a lategame spawner tower. It summons large mecha robots and shares the spawner placement cap of 5. The mecha itself travels across the path very slowly and has a lot of range. As this tower is very expensive, you should really farm for it. Unlike most other towers, it is officially labeled as mecha and is sometimes referred to as Robot by some clueless/mislead players. It is unlikely you will manage to get it maxed unless you've pretty much killed the The Omega, so you should rely on towers like sniper and ak-47 to defend until he is sufficiently harmed enough for you to upgrade.