Lightsabre Thrower is the final upgrade for the Boomerang Thrower in Bloons Tower Defense 4. It can pop up to 70 bloons before its lightsabre returns. The lightsabre is also capable of popping Lead Bloons. It costs $1,575 on Easy, $1,850 on Medium and $2,000 on Hard. This upgrade is good for swarms of bloons because it can pop many of them.