"Army slots" are the bottom 3 slots in each build. They are awarded from successful dungeon completions and every leader has a distinct pool of options. Each slot can be changed after unlocking by spending Arclight Energy.
Summary
The original Elite Tauren Chieftain
Leader Ability
Earthen Might
Your troops have 20% increased Health.
Traits
Tank
Attack Stun
Melee
AoE
Possible Army Slots
Talents
Reincarnation
After death, Resurrect at 50% health, once.
Plainsrunning
Move 50% faster and gain the Fast trait.
Aftershock
When Stun expires, affected enemies are Dazed for 5 seconds.
Recommended Build