The Lost Battalion consists of resilient, undead soldiers specializing in defensive formations and Block tokens. The Foot Soldier and Knight are front-line tanks that protect back-line threats like the Arbalist. The Bishop is a primary concern, as its Smite and Serving the Light skills can generate Resolute tokens, healing allies and stressing your party. The Drummer dictates the flow of battle, providing Order buffs that grant enemies extra actions or defensive utility; eliminating them early is vital to breaking the enemy's formation.
To overcome the Battalion's high HP and Block tokens, utilize Damage over Time (DoT) effects—specifically Burn and Blight—to bypass their physical defenses. Move skills are highly effective; pulling a Bishop or Arbalist to the front rank renders their most dangerous abilities unusable. Conversely, pushing a Knight to the back reduces its threat level. Focus on stripping Block tokens with multi-hit attacks or using skills that Ignore Block to quickly take down high-priority targets like the Drummer or Bishop before they can solidify the enemy's ranks.