Horizon Zero Dawn: The Rockbreaker ExpansionA mountain of a challenge, Rockbreaker is one of the biggest machines you can hunt in Horizon Zero Dawn: The Board Game. This unpredictable enemy won't be easy to take down. Unlike other machines, Rockbreaker travels by tunneling underground, bursting from the earth where you least expect it before disappearing once more. Whether you're chasing it across a tile or avoiding an attack, get ready to run!