Home / Tactics / Impregnable Impregnable: Tactic Effect and Officers Impregnable Command 5★ Each round, the allied group has a 12% chance to become Invincible (immune to all damage). Officers with Impregnable Xiao Qiao ★★★★★ Lineups using Impregnable Pang Tong - Guan Yu - Zhang Fei 5★ lineup Lu Bu - Dong Zhuo - Pang Tong 5★ lineup Xun Yu - Zhang Liao - Cao Cao 5★ lineup Zhou Yu - Lu Xun - Sun Quan 5★ lineup Zhou Yu - Xiao Qiao - Da Qiao 5★ lineup Zhuge Liang - Guan Yu - Zhang Fei 5★ lineup