"Army slots" are the bottom 3 slots in each build. They are awarded from successful dungeon completions and every leader has a distinct pool of options. Each slot can be changed after unlocking by spending Arclight Energy.
When you are a buzzsaw, all your problems look like trees.
Sneed Before Greed
Gain 2 Gold when a unit destroys a Tower, captures a Meeting Stone, or opens a Chest.
Mine Is Money, Friend!
Gain the Miner trait.
Lead with Greed
Gain an additional +2 Gold when Sneed triggers Sneed Before Greed.
Gain a level whenever Sneed Before Greed triggers.