Spiketrack Factory.
This 5x5 tower is good to have as backup in case large waves of mobs break through your defence.
This tower will lay down spiketracks on the ground, inflicting damage on the mobs dumb enough to step on these.
Since having a lot of these can be quite overpowered, these mighty machines are costly. They cost around 1500 coins to unlock in the shop.
Building one of these costs 1200 coins, upgrading it to tier II costs 700 and upgrading it to tier III costs 900.
The witherboss likes attacking these towers, meaning spiketrack factorys are likely to be destroyed during armagedon mode.
Tier I:
The tier I tower can lay down spiketracks in a 6 to 7 block range and can have a maximum of 3 spiketracks active at a time.
Spiketracks spawned by this tier look like a light gray carpet. If a mob walks over this spiketrack it will recieve 5 to 6 damage. The spiketrack gets destroyed when a mob walks over it. Flying mobs fly over these tracks, meaning they won't activate them and won't receive damage from this.
Tier II:
The tier II tower can lay down spiketracks in a 8 to 10 block range and can have a maximum of 5 spiketracks active at a time.
Spiketracks spawned by this tier look like a gray carpet. If a mob walks over this spiketrack it will recieve 8 to 11 damage. The spiketrack gets destroyed when a mob walks over it. Flying mobs fly over these tracks, meaning they won't activate them and won't receive damage from this.
Tier III:
The tier III tower can lay down spiketracks in a 10 to 14 block range and can have a maximum of 10 spiketracks active at a time.
Spiketracks spawned by this tier look like a black carpet. If a mob walks over this spiketrack it will recieve 12 to 16 damage. The spiketrack gets destroyed when a mob walks over it. Unlike the tier I & II these spiketracks scatter when stepped on, dealing 5-8 damage to nearby mobs. This includes flying mobs.
This tower can't damage slimes and magma cubes, as they absorb the spikes like a tasty meal (they destroy spiketracks but don't recieve damage from them).
(I couldn't figure out how to insert images from my computer into this entry, so I added them as files. The damage, costs and range of these machines can be tweaked a bit if needed. Sorry if I added to many screenshots to this post, I wasn't sure how many to add :/ )
Hopefully people like this idea :D