The Dart Lord

The Dart Lord is a powerful, dart-based tower. Unlike those other towers that start out with darts, it NEVER stops using them, no matter which upgrades it has. By default, its darts pop 1 layer off of 1 bloon, but the darts can pop through frozen bloons. It uses both of its arms, but fires at a mere 6 darts per second per arm. It costs $2440 on Medium.

Dangerously Sharp Darts
Description: Darts can pop through 5 bloons!

Cost: $1000

That's what happens.

Flame Darts
Description: Burning darts enable this tower to pierce the leads.

Cost: $1750

It also pops through 6 bloons, but don't tell anyone this.

Scorcher Darts
Description: Using monkey napalm, these darts can melt down any bloon.

Cost: $2200

Bloons loose 2 layers to this and go under the effect of Burny Stuff/the aftermath of Spiked Mines.

Annihilator Darts
Description: Specially modified darts can shred through any type of bloon without trouble.

Cost: $10000

This rips through 6 layers of bloon PER DART. The tower itself can't detect camos, but if a camo is very close to the target, the dart'll effect it, too. It also pops through up to 50 bloons.

Increased Fire Rate
Description: Elbow grease and potato skins enable this tower to fire a good lot faster.

Cost: $2400

Fire rate is increased to 12 darts/second/arm.

Awesome Eyesight
Description: Special awesome contact lenses enable this tower to hit camos, as well as an incredible range.

Cost: $700

Detects camos and gets a 70% range boost.

Dart Overlord
Description: Throws five darts per shot.

Cost: $1900

The angle between the outermost darts is 30º; the seperation between individual darts is 7.5º.

Temple of the Dart God
Description: The ultimate ruler of dart-related destruction projects himself onto the mortal plane - for a price.

Cost: $100000

The TOTDG is the most powerful thing ever that relies purely on darts. It fires 50 darts/second/fire point. It has 8 fire points; those are both its eyes, its arms, and four independant monkey statues. Its darts can pierce 100 bloons per dart, as well as piercing through lead. Its darts also permanently reduce the strength of a bloon's shield by 1 PER HIT. It fires 5 darts per shot still. Unlike the TOTMG, it doesn't need sacrifices - it's powerful enough on its own.

Trivia

 * This is the only tower that I know of that never abandons darts.
 * The TOTDG rivals the TOTMG in pure epicness - in fact, it is stronger than one that lacks sacrifices.