Less HP[]
Some of those units have a huge amount of HP at the point of become almost invincible like Iron Fortress for example, these units are the ones who need to reduce its HP.
Less Damage[]
Similar to the balance given to Doctor(Brave Guerrier), these units will not have a huge amount of attack.
Unable to Attack Enemy's Base[]
Similar to Morden and Nadia(Monkey)'s balance, these units can attack the enemy units but it's base is not gonna be damaged.