Units

They are the soldiers that you can spawn, as they are:

Guardsman

Helian Archer

Scout

Marine

Skirmisher

Pikeman

Legionary

Assasin

Sun Priest

Engineer

Border Cavalry

Centurion

Moon Priestess

Siege Crossbow

Templar

Liegeblade

Banner Guard

Hearthguard

Shield Maiden

Ranger

Shieldbreaker

Lancer

Trivia
The Shieldbreaker can 1v1 a Reaper of Souls and win, assuming it is fully upgraded.

The Moon Priestess is the unit with the lowest attack in the game.

The Assasin is the only unit that can use the poison ability.

The Hearthguard has the highest HP stat in the game.