"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
If Ragnaros was your boss, you'd be cranky too.
Leader Ability
Fiery Weapon Enchant
While in play, Allies apply when dealing Non-Elemental damage.
He's a bad guy, Moira less.
Traits
Elemental
Fiery Weapon Enchant
Bombard
Tank
Ranged
AoE
Possible Army Slots
Talents
Moira's Wit
Nearby Burning enemies Heal Thaurissan.
Hubris
After playing Thaurissan, your next non-Elemental Mini deploys with +2 levels.
Incinerate
Lava Spike's Burn is permanent.
Recommended Build