The Undercity: Black River Irregulars is a hero expansion for The Undercity: An Iron Kingdoms Adventure Board Game that can be mixed together with heroes from the core game. The four new characters taken from Privateer's "Black River Irregulars" lore available for player use are: Colbie Sterling, cunning strategist with slug gun attacks Eilish Garrity, battle-mage with arcane magic attacks Bastian Kinnet, battle-chaplain with divine-healing and mace attacks Barl Blackheel, Rhulic pistoleer with dirty fighting techniques