Glaive Lord is the final upgrade for Path 1 of the Boomerang Thrower in BTD5. It costs $7650 on Easy, $9000 on Medium, $9720 on Hard and $10800 on Impoppable. In BTD Battles, it costs $4500. The Glaive Lord acquires two permanent glaives that rotate around the tower, shredding bloons that come into contact with the glaives. Glaive Riccochet is still used along with the rotating secondary glaives and can pop even more bloons. This upgrade also gives the tower camo detection. The glaives only rotate around the Boomerang Thrower during a round. This upgrade is perfect for compact tracks like Monkey Lane, or tracks with many curves like Park Path. This tower works very well if combined with Arctic Wind and/or Glue Hose.
For some reason, Glaive Lords don't do nearly as much damage to MOAB-Class Bloons in the Mobile version as they do in the PC version. This was probably done for balancing reasons.
In the PC version, in between rounds, the Glaives continue to circulate around the tower, just like Dartling Gun, which will not turn on between rounds.
In the Mobile version, if the tower is not upgraded with Red Hot 'Rangs, it will make no sound when it tries to hit Lead Bloons. This also occurs with Glaive Riccochet.
The secondary glaives orbit clockwise. To maximize their popping power, put them in a corner where the bloons go counterclockwise.
The Bloons Monkey City description says that Glaive Lord is an ancient technique of the Monkey martial arts.
A single Glaive Lord in conjunction with an Arctic Wind can deal with seemingly infinite amounts of regular Bloons.
The Glaive Lord is one of a few towers with infinite popping power (orbital glaives). The other towers include Ice Tower (gains popping power if upgraded to 2/0 or 0/3), Blade Maelstrom (ability), and Ground Zero (ability).
The Glaive Lord is weak by itself, although massed Glaive Lords are very powerful.