The Bronze Automaton is a multi-phase fight. It starts by summoning two Orb Walkers, which apply Vulnerable. Eliminate these quickly. The Automaton then attacks and can summon more Orbs (Lightning, Frost, Dark). It also has a powerful 'Hyper Beam' attack. Focus on dealing consistent damage to the Automaton while managing the Orbs. Block is essential for surviving the Hyper Beam. Cards that provide AoE or target specific Orbs are beneficial.
