diff --git a/iOS/MonsterCards/Models/Monster.m b/iOS/MonsterCards/Models/Monster.m
index 1985458..3d2159f 100644
--- a/iOS/MonsterCards/Models/Monster.m
+++ b/iOS/MonsterCards/Models/Monster.m
@@ -85,6 +85,10 @@
     if (tempNumber != nil && [tempNumber isKindOfClass:[NSNumber class]]) {
         self.dexterityScore = tempNumber.intValue;
     }
+    tempNumber = [jsonRoot objectForKey:@"conPoints"];
+    if (tempNumber != nil && [tempNumber isKindOfClass:[NSNumber class]]) {
+        self.constitutionScore = tempNumber.intValue;
+    }
     return self;
 }
 
@@ -136,7 +140,7 @@
 }
 
 -(int)constitutionModifier {
-    @throw [[NSException alloc] initWithName:@"unimplemented" reason:@"Method not implemented." userInfo:nil];
+    return [Monster abilityModifierForScore:self.constitutionScore];
 }
 
 -(int)intelligenceModifier {
@@ -350,6 +354,7 @@
     self.alignment = monster.alignment;
     self.strengthScore = monster.strengthScore;
     self.dexterityScore = monster.dexterityScore;
+    self.constitutionScore = monster.constitutionScore;
 }
 
 @end
diff --git a/iOS/MonsterCardsTests/Models/MonsterTests.m b/iOS/MonsterCardsTests/Models/MonsterTests.m
index 440b046..c6a76af 100644
--- a/iOS/MonsterCardsTests/Models/MonsterTests.m
+++ b/iOS/MonsterCardsTests/Models/MonsterTests.m
@@ -25,7 +25,7 @@
 - (void)setUp {
     _context = nil;
     _monster = [[Monster alloc] initWithContext:_context];
-    _jsonString = @"{\"name\":\"Acolyte\",\"size\":\"medium\",\"type\":\"humanoid\",\"tag\":\"any race\",\"alignment\":\"any alignment\",\"strPoints\":8,\"dexPoints\":10}";
+    _jsonString = @"{\"name\":\"Acolyte\",\"size\":\"medium\",\"type\":\"humanoid\",\"tag\":\"any race\",\"alignment\":\"any alignment\",\"strPoints\":8,\"dexPoints\":10,\"conPoints\":12}";
     _jsonData = [_jsonString dataUsingEncoding:NSUTF8StringEncoding];
 }
 
@@ -42,6 +42,7 @@
     XCTAssertEqualObjects(@"", _monster.alignment);
     XCTAssertEqual(0, _monster.strengthScore);
     XCTAssertEqual(0, _monster.dexterityScore);
+    XCTAssertEqual(0, _monster.constitutionScore);
 }
 
 - (void)testInitWithJSONString {
@@ -55,6 +56,7 @@
     XCTAssertEqualObjects(@"any alignment", _monster.alignment);
     XCTAssertEqual(8, _monster.strengthScore);
     XCTAssertEqual(10, _monster.dexterityScore);
+    XCTAssertEqual(12, _monster.constitutionScore);
 }
 
 - (void)testInitWithEmptyJSONString {
@@ -68,6 +70,7 @@
     XCTAssertEqualObjects(@"", _monster.alignment);
     XCTAssertEqual(0, _monster.strengthScore);
     XCTAssertEqual(0, _monster.dexterityScore);
+    XCTAssertEqual(0, _monster.constitutionScore);
 }
 - (void)testInitWithJSONData {
     _monster = [[Monster alloc] initWithJSONData:_jsonData andContext:_context];
@@ -80,6 +83,7 @@
     XCTAssertEqualObjects(@"any alignment", _monster.alignment);
     XCTAssertEqual(8, _monster.strengthScore);
     XCTAssertEqual(10, _monster.dexterityScore);
+    XCTAssertEqual(12, _monster.constitutionScore);
 }
 
 - (void)testNameGetterAndSetter {
@@ -123,6 +127,7 @@
     XCTAssertEqualObjects(@"any alignment", _monster.alignment);
     XCTAssertEqual(8, _monster.strengthScore);
     XCTAssertEqual(10, _monster.dexterityScore);
+    XCTAssertEqual(12, _monster.constitutionScore);
 }
 
 - (void)testMetaWithNoFieldsSet {
@@ -273,4 +278,20 @@
     XCTAssertEqual(1, _monster.dexterityModifier);
 }
 
+- (void)testConstitutionScoreGetterAndSetter {
+    _monster.constitutionScore = 11;
+    XCTAssertEqual(11, _monster.constitutionScore);
+}
+
+- (void)testConstitutionModifier {
+    _monster.constitutionScore = 9;
+    XCTAssertEqual(-1, _monster.constitutionModifier);
+    
+    _monster.constitutionScore = 10;
+    XCTAssertEqual(0, _monster.constitutionModifier);
+    
+    _monster.constitutionScore = 12;
+    XCTAssertEqual(1, _monster.constitutionModifier);
+}
+
 @end