Can shoot 3 grappling hooks at once, and plunder extra cash from each MOAB-Class Bloon brought down with them.
~ BTD6 descripton
Pirate Lord is the final upgrade in Path 2 for the Monkey Buccaneer in Bloons TD 6. The base attacks like darts, grapes and bombs now attack twice as fast. It grants an ability that allows the Buccaneer to pull down up to 3 MOAB Class Bloons. The player receives twice the amount of cash for each MOAB pulled. In addition, Pirate Lord has no initial cooldown, allowing its ability to be immediately usable upon upgraded (provided Monkey Pirates ability is not on cooldown besides initial cooldown). Cooldown for the ability upon activation is 30 seconds (half the cooldown compared to Monkey Pirates).
This upgrade costs $17,850 on Easy, $21,000 on Medium, $22,680 on Hard, and $25,200 on Impoppable.
Alchemist's Rubber to Gold upgrade will increase the cash earned by the Pirate Lord's pulling ability, assuming that MOAB-Class Bloons are turned into gold.
Place the Pirate Lord in the range of a 4+-x-x Sub to at least decrease its ability cooldown by 15%. (50% with Energizer)
Only use Pirate Lord if really needed, like rounds 95, 98, and 99.
If camo detection is granted by other sources, it is advised to choose top path as the speed buff from Faster Shooting stack with the speed increase from this upgrade and Double Shot benefits from all the speed boosts greatly.
There used to be a bug where the Pirate Lord only pulls down 2 M.O.A.B. Class Bloons, probably due Ninja Kiwi not yet figuring out the complicated ZOMG-pulling algorithm. This was fixed on Version 1.7.
The increase attack speed seems random, but it might be a reference to Battleship from BTD 4 while giving more incentive to upgrade the tower besides a better ability.