diff.patch

diff --git a/engine/class_modules/sc_mage.cpp b/engine/class_modules/sc_mage.cpp
index 25ce93d64..eccfab486 100755
--- a/engine/class_modules/sc_mage.cpp
+++ b/engine/class_modules/sc_mage.cpp
@@ -902,6 +902,27 @@ struct mage_spell_base_t : public spell_t
       {
         sim -> errorf( "Player %s firestarer expression: unknown operation '%s'", player -> name(), splits[ 1 ].c_str() );
       }
+    } else if ( splits.size() == 4 && util::str_compare_ci( splits[ 0 ], "action" ) && util::str_compare_ci( splits[ 1 ], "arcane_blast" ) ) {
+      enum arcane_blast_expr_type_e { BASE_COST, CHARGED_COST };
+
+      struct arcane_blast_charged_cost_expr_t : public expr_t {
+        mage_t& mage;
+        action_t* a;
+        int arcane_charges;
+
+        arcane_blast_charged_cost_expr_t( mage_t& m, const std::string& name, action_t* a, int arcane_charges = 0 ) :
+            expr_t( name ), mage( m ), a( a ), arcane_charges( arcane_charges ) { }
+
+        double evaluate() override {
+          // unknown type name 'arcane_blast_t'
+          return debug_cast<const arcane_blast_t*>( a ) -> cost();
+        }
+      };
+
+      if ( util::str_compare_ci( splits[ 2 ], "charged_cost" ) )
+      {
+        return new arcane_blast_charged_cost_expr_t( *mage, expr_str, this, atof( splits[ 3 ].c_str() ) );
+      }
     }
 
     return spell_t::create_expression( expr_str );
@@ -2347,13 +2368,21 @@ struct arcane_blast_t : public arcane_mage_spell_t
     }
   }
 
-  virtual double cost() const override
-  {
+  double charged_cost( int arcane_charges ) const {
     double c = arcane_mage_spell_t::cost();
 
-    c *= 1.0 + p() -> buffs.arcane_charge -> check() *
-               p() -> spec.arcane_charge -> effectN( 5 ).percent();
+    c *= 1.0 + arcane_charges * p() -> spec.arcane_charge -> effectN( 5 ).percent();
+
+    return c;
+  }
 
+  double charged_cost() const {
+    return charged_cost( p() -> buffs.arcane_charge -> check() );
+  }
+
+  virtual double cost() const override
+  {
+    double c = charged_cost();
 
     c *= 1.0 + p() -> buffs.rule_of_threes -> check_value();