Darkest Dungeon Boss Battle - Brigand 8 Pounder Playthrough
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The Brigand Pounder spawns on the second rank with an assortment of Brigands to support it in the other three ranks. The most important of these support units is a special Brigand called the Matchman. While the Pounder has no turns of its own, the Matchman's "Fire in the Hole!" gives the Pounder a turn, allowing it to attack the entire party for colossal damage.
As it has no turns, the Pounder cannot perform any abilities other than its Auto-Action "Reinforcements!", which summons additional Brigand units. It will use this ability immediately at the start of every turn unless all other ranks are filled. This attack will ALWAYS summon a Matchman if one is not present.
If the Matchman is allowed to act, the Pounder will use one of two attacks. The first is "BOOOOOOOM!", a ranged attack that hits the entire party for catastrophic damage as well as inflict heavy stress. The second, "MISFIRE!", does nothing but gives the party a sizable stress heal.
As stated above, the likelihood of the Pounder scoring its devastating attack will INCREASE for veteran and champion dungeons.
Source:
https://darkestdungeon.gamepedia.com/Brigand_Pounder