Talk:FAQ/@comment-107.185.178.153-20160627001224/@comment-72.89.23.45-20160627031851

You can't unlock slots for troops on a sword. Each sword has a fixed amount of troop slots based on rarity. The max amount of slots is 3, but only for certain swords (like Mikazuki or Hotarumaru). Most swords can only have 2 troops.

The only way I know to increase troop slots is through kiwame.