diff --git a/config/heroes/fortress.json b/config/heroes/fortress.json
index 554ae0329..86975e440 100644
--- a/config/heroes/fortress.json
+++ b/config/heroes/fortress.json
@@ -68,11 +68,12 @@
 		"specialty" : {
 			"bonuses" : {
 				"armorer" : {
-					"subtype" : "skill.armorer",
-					"type" : "SECONDARY_SKILL_PREMY",
+					"type" : "GENERAL_DAMAGE_REDUCTION",
+					"subtype" : -1,
+					"targetSourceType" : "SECONDARY_SKILL",
 					"updater" : "TIMES_HERO_LEVEL",
 					"val" : 5,
-					"valueType" : "PERCENT_TO_BASE"
+					"valueType" : "PERCENT_TO_TARGET_TYPE"
 				}
 			}
 		}
diff --git a/config/heroes/rampart.json b/config/heroes/rampart.json
index 48fedfe0a..acd008ea7 100644
--- a/config/heroes/rampart.json
+++ b/config/heroes/rampart.json
@@ -12,11 +12,12 @@
 		"specialty" : {
 			"bonuses" : {
 				"armorer" : {
-					"subtype" : "skill.armorer",
-					"type" : "SECONDARY_SKILL_PREMY",
+					"type" : "GENERAL_DAMAGE_REDUCTION",
+					"subtype" : -1,
+					"targetSourceType" : "SECONDARY_SKILL",
 					"updater" : "TIMES_HERO_LEVEL",
 					"val" : 5,
-					"valueType" : "PERCENT_TO_BASE"
+					"valueType" : "PERCENT_TO_TARGET_TYPE"
 				}
 			}
 		}
diff --git a/config/heroes/tower.json b/config/heroes/tower.json
index 2e95c9eb9..ebfa965bc 100644
--- a/config/heroes/tower.json
+++ b/config/heroes/tower.json
@@ -57,11 +57,12 @@
 		"specialty" : {
 			"bonuses" : {
 				"armorer" : {
-					"subtype" : "skill.armorer",
-					"type" : "SECONDARY_SKILL_PREMY",
+					"type" : "GENERAL_DAMAGE_REDUCTION",
+					"subtype" : -1,
+					"targetSourceType" : "SECONDARY_SKILL",
 					"updater" : "TIMES_HERO_LEVEL",
 					"val" : 5,
-					"valueType" : "PERCENT_TO_BASE"
+					"valueType" : "PERCENT_TO_TARGET_TYPE"
 				}
 			}
 		}
diff --git a/config/skills.json b/config/skills.json
index 24815189a..9526e63dd 100644
--- a/config/skills.json
+++ b/config/skills.json
@@ -672,8 +672,8 @@
 		"base" : {
 			"effects" : {
 				"main" : {
-					"subtype" : "skill.armorer",
-					"type" : "SECONDARY_SKILL_PREMY",
+					"type" : "GENERAL_DAMAGE_REDUCTION",
+					"subtype" : -1,
 					"valueType" : "BASE_NUMBER"
 				}
 			}
diff --git a/lib/HeroBonus.h b/lib/HeroBonus.h
index f11ce9fb8..daa88a9e6 100644
--- a/lib/HeroBonus.h
+++ b/lib/HeroBonus.h
@@ -257,7 +257,7 @@ public:
 	BONUS_NAME(SPELLCASTER) /*subtype - spell id, value - level of school, additional info - weighted chance. use SPECIFIC_SPELL_POWER, CREATURE_SPELL_POWER or CREATURE_ENCHANT_POWER for calculating the power*/ \
 	BONUS_NAME(CATAPULT)								\
 	BONUS_NAME(ENEMY_DEFENCE_REDUCTION) /*in % (value) eg. behemots*/ \
-	BONUS_NAME(GENERAL_DAMAGE_REDUCTION) /* shield / air shield effect */ \
+	BONUS_NAME(GENERAL_DAMAGE_REDUCTION) /* shield / air shield effect, also armorer skill/petrify effect for subtype -1*/ \
 	BONUS_NAME(GENERAL_ATTACK_REDUCTION) /*eg. while stoned or blinded - in %,// subtype not used, use ONLY_MELEE_FIGHT / DISTANCE_FIGHT*/ \
 	BONUS_NAME(DEFENSIVE_STANCE) /* val - bonus to defense while defending */ \
 	BONUS_NAME(ATTACKS_ALL_ADJACENT) /*eg. hydra*/		\
@@ -335,7 +335,7 @@ public:
 	BONUS_NAME(LEARN_BATTLE_SPELL_CHANCE) /*skill-agnostic eagle eye chance. subtype = 0 - from enemy, 1 - TODO: from entire battlefield*/\
 	BONUS_NAME(LEARN_BATTLE_SPELL_LEVEL_LIMIT) /*skill-agnostic eagle eye limit, subtype - school (-1 for all), others TODO*/\
 	BONUS_NAME(PERCENTAGE_DAMAGE_BOOST) /*skill-agnostic archery and offence, subtype is 0 for offence and 1 for archery*/\
-	BONUS_NAME(LEARN_MEETING_SPELL_LIMIT) /*skill-agnostic scholar, subtype is -1 for all, TODO for others (> 0)*/
+	BONUS_NAME(LEARN_MEETING_SPELL_LIMIT) /*skill-agnostic scholar, subtype is -1 for all, TODO for others (> 0)*/\
 	/* end of list */
 
 
diff --git a/lib/battle/DamageCalculator.cpp b/lib/battle/DamageCalculator.cpp
index c19a7b2fd..3bc58368d 100644
--- a/lib/battle/DamageCalculator.cpp
+++ b/lib/battle/DamageCalculator.cpp
@@ -277,8 +277,8 @@ double DamageCalculator::getDefenseSkillFactor() const
 
 double DamageCalculator::getDefenseArmorerFactor() const
 {
-	const std::string cachingStrArmorer = "type_SECONDARY_SKILL_PREMYs_ARMORER";
-	static const auto selectorArmorer = Selector::typeSubtype(Bonus::SECONDARY_SKILL_PREMY, SecondarySkill::ARMORER);
+	const std::string cachingStrArmorer = "type_GENERAL_DAMAGE_REDUCTIONs_N1_NsrcSPELL_EFFECT";
+	static const auto selectorArmorer = Selector::typeSubtype(Bonus::GENERAL_DAMAGE_REDUCTION, -1).And(Selector::sourceTypeSel(Bonus::SPELL_EFFECT).Not());
 	return info.defender->valOfBonuses(selectorArmorer, cachingStrArmorer) / 100.0;
 
 }
@@ -382,8 +382,8 @@ double DamageCalculator::getDefenseForgetfulnessFactor() const
 double DamageCalculator::getDefensePetrificationFactor() const
 {
 	// Creatures that are petrified by a Basilisk's Petrifying attack or a Medusa's Stone gaze take 50% damage (R8 = 0.50) from ranged and melee attacks. Taking damage also deactivates the effect.
-	const std::string cachingStrAllReduction = "type_GENERAL_DAMAGE_REDUCTIONs_N1";
-	static const auto selectorAllReduction = Selector::typeSubtype(Bonus::GENERAL_DAMAGE_REDUCTION, -1);
+	const std::string cachingStrAllReduction = "type_GENERAL_DAMAGE_REDUCTIONs_N1_srcSPELL_EFFECT";
+	static const auto selectorAllReduction = Selector::typeSubtype(Bonus::GENERAL_DAMAGE_REDUCTION, -1).And(Selector::sourceTypeSel(Bonus::SPELL_EFFECT));
 
 	return info.defender->valOfBonuses(selectorAllReduction, cachingStrAllReduction) / 100.0;
 }