Arclight Tower

The arclight is an effective tool introduced with waldgeist, although not immediately. To employ it, you need to first research the sensor, although you will find that you usually need to research this in waldgeist levels. It is an electricity firing tower with a decent fire rate, great damage and most notably the ability to chain it's attack to multiple enemies. This allows it good crowd control, but it can't hit air. Against low numbers of enemies, the particle tower is in theory superior. Having either usually condemns many land based enemies anyway.