Defense in Heroes 4

Basic Defense increases the Melee and Ranged Defense of all friendly creatures by 10%. It is required to learn Expert Tactics.

Advanced Defense increases the Melee and Ranged Defense of all friendly creatures by 20%. It is required to learn Master Tactics.

Expert Defense increases the Melee and Ranged Defense of all friendly creatures by 30%. It is required to learn Grandmaster Tactics.

Master Defense increases the Melee and Ranged Defense of all friendly creatures by 40%.

Grandmaster Defense increases the Melee and Ranged Defense of all friendly creatures by 50%.