diff --git a/server/src/cryp.rs b/server/src/cryp.rs
index 7ccb4531..4fcc6323 100644
--- a/server/src/cryp.rs
+++ b/server/src/cryp.rs
@@ -433,6 +433,7 @@ impl Cryp {
         if immune {
             return ResolutionResult::Damage {
                 amount: 0,
+                mitigation: 0,
                 category: Category::PhysDmg,
                 immunity,
             };
@@ -474,6 +475,7 @@ impl Cryp {
         if immune {
             return ResolutionResult::Damage {
                 amount: 0,
+                mitigation: 0,
                 category: Category::SpellDmg,
                 immunity,
             };
@@ -488,17 +490,21 @@ impl Cryp {
 
         let modified_spell_dmg = spell_dmg_mods.iter().fold(amount, |acc, m| m.apply(acc));
 
-        // reduce spell_shield by damage amount
-        self.spell_shield.reduce(modified_spell_dmg);
+        // calculate amount of damage armour will not absorb
+        // eg 50 armour 25 dmg -> 25 remainder
+        //    50 armour 100 dmg -> 0 remainder
+        let remainder = self.spell_shield.base.saturating_sub(modified_spell_dmg);
+        let mitigation = modified_spell_dmg.saturating_sub(remainder);
 
-        // reduce amount by the amount absorbed by spell_shield
-        let remainder = amount.saturating_sub(modified_spell_dmg);
+        // reduce armour by damage amount
+        self.armour.reduce(modified_spell_dmg);
 
         // deal remainder to hp
         self.hp.reduce(remainder);
 
         return ResolutionResult::Damage {
             amount: modified_spell_dmg,
+            mitigation,
             category: Category::SpellDmg,
             immunity,
         };