Okay, so there are Classes in Heroes KeepTM. For Warriors, this is how advancements go:
1st Class Change (Level 50)
Warrior - Swords Master / Master Spearman / Brute
2nd Class Change (Level 100)
Swords Master - Hero (Uses Swords and Shields)
Master Spearman - Dragon Warrior (Uses Spears)
Brute - Black Knight (Uses Maces)
Each class has a class leader, usually a high-leveled warrior/ archer/ mage. I am the leader for the Hero class.
In order to lead a class, you must be the highest level in that class.