Jackhammer Tower

The Jackhammer is a expensive tower that, once activated, sends a shockwave rippling across a large area of the map. Unlike most other towers, which fire automatically, the Jackhammer will only 'fire' when the owner taps/clicks on it. It does 150% damage to burrowing enemies, but cannot hit flying targets unless upgraded.

Cost:1000 credits Range:8 Damage: 1000 (Blast)

1st upgrade
Cost: 1225 credits Range: 9 Damage: 1500 (Blast), 25 per second (Crack)

When the Jackhammer is upgraded to it's 1st stage, visually it grows in height and gains extra steel girders. The damage of the tower is increased, and a small area around the tower will crack when it is activated. Enemies that enter the crack radius are slowed down and damaged, and burrowing enemies are forced to surface.

2nd upgrade
Cost: 2000 credits Range: 10 Damage: 2000 (Blast), 30 (Lava), 10 per second (Burn)

The Jackhammer gains red decals and steel/concrete walls around it. Damage is increased again, and the crack grows in size. Lava occasionally spurts out of the cracks, dealing additional flame damage. Burrowing enemies that enter the crack are instantly killed.

3rd upgrade
Cost: 3750 Credits Range: 12 Damage: 3000 (Blast), 40 (Lava), 20 per second (Burn) If the player decides to upgrade the tower to this stage, the tower gains spotlights that can detect certain stealthed enemies, as well as warning stripes and sirens. Damage is substantially increased, and the sirens will wail when the tower is ready to strike. This debuffs enemies across the map, making their speed slower.

Final Upgrade
Cost: 5000 Credits Range: 14 Damage: 4500 (Blast), 50 (Lava), 30 per second (Burn), 1000 (Explosion), 300 (Spike)

The last upgrade of the Jackhammer, buying this upgrade causes it to gain titanium girders and replaces the original iron 'hammer' with a heavier uranium 'hammer'. The force of the hammer is so strong that the vibrations cause turbulence in the air, slowly damaging aerial foes over time. A modestly-sized explosion is also created around the tower, dealing very heavy damage to any enemy that happens to be caught near the blast zone. Stone spikes will also rise in random places, tossing enemies on top of it into the air.