Armorer
Armorer is a secondary skill, that reduces the physical damage done to hero's creatures. Physical damage means damage done by enemy creatures engaged in melee or ranged combat. Armorer secondary skill does not reduce damage from spells cast by enemy heroes or creatures.
It should be noted, that due to a bug in the game, the damage from arrow towers during siege combat is not reduced by armorer secondary skill, but actually increased the corresponding amount.
Heroes with Armorer as a starting skill
The following heroes all start with Basic Armorer:
Heroes with an Armorer specialty
The following heroes all receive a 5% bonus per level to their Armorer skill:
Discussion
Armorer skill is unquestionably one of the most useful secondary skills in the game. At expert level it reduces 15% of all physical damage, which, though not strictly speaking true, effectively increases allied creatures' health by 15%. This leads to fewer casualties in battles, and more troops for the next battle. Especially in extra large maps this may give the needed edge to vanquish the enemy.