diff --git a/src/NosCore.Data/Enumerations/Buff/AdditionalTypes.cs b/src/NosCore.Data/Enumerations/Buff/AdditionalTypes.cs
index c540af286..f37b0fc7a 100644
--- a/src/NosCore.Data/Enumerations/Buff/AdditionalTypes.cs
+++ b/src/NosCore.Data/Enumerations/Buff/AdditionalTypes.cs
@@ -110,7 +110,13 @@ public enum Block : byte
             ChanceRangedIncreased = 31,
             ChanceRangedDecreased = 32,
             ChanceMagicalIncreased = 41,
-            ChanceMagicalDecreased = 42
+            ChanceMagicalDecreased = 42,
+
+            /// <summary>
+            /// Per-critical reduction over a run of hits, not a chance like 11-42.
+            /// </summary>
+            CriticalDamageReducedPerHit = 51,
+            CriticalDamageReducedPerHitNegated = 52
         }
 
         public enum BossMonstersSkill : byte
@@ -631,16 +637,36 @@ public enum Morale : byte
             IgnoreEnemyMoraleNegated = 52
         }
 
+        /// <summary>
+        /// 21-22 are a percentage and 41-42 are flat, which the names do not say. 11-12 and 51-52
+        /// carry the same text as each other in the files, so the X2 slot has no meaning of its own.
+        /// </summary>
         public enum Move : byte
         {
             MovementImpossible = 11,
             MovementImpossibleNegated = 12,
+
+            /// <summary>Movement speed is increased by %s%%.</summary>
             MoveSpeedIncreased = 21,
+
+            /// <summary>Movement speed is decreased by %s%%.</summary>
             MoveSpeedDecreased = 22,
-            SetMovement = 31,
-            SetMovementNegated = 32,
+
+            /// <summary>
+            /// Your movement speed is increased by %s <b>while you are hidden</b>. Not a "set
+            /// movement" of any kind: it is a flat bonus that only applies while invisible.
+            /// </summary>
+            SpeedWhileHiddenIncreased = 31,
+
+            /// <summary>Your movement speed is decreased by %s while you are hidden.</summary>
+            SpeedWhileHiddenDecreased = 32,
+
+            /// <summary>Movement speed is increased by %s. This is the unconditional flat one.</summary>
             MovementSpeedIncreased = 41,
+
+            /// <summary>Movement speed is decreased by %s.</summary>
             MovementSpeedDecreased = 42,
+
             TempMaximized = 51,
             TempMaximizedNegated = 52
         }
@@ -1292,14 +1318,21 @@ public enum Type103 : byte
             DecreaseConcentration = 52
         }
 
+        /// <summary>
+        /// 52 targets allies, not enemies - it is not the negation of 51.
+        /// </summary>
         public enum Type104 : byte
         {
             ReflectOnDeff = 11,
             ReflectOnDeffNegated = 12,
             AreaDamageEachSecond = 21,
+            AreaDamageEachSecondNegated = 22,
             SummonMonsterOnDef = 31,
-            //SubType 4 didn't exist.
-            AreaBuffEachSecond = 51
+            SummonTwoMonstersOnDef = 32,
+            MateAttackIncreased = 41,
+            MateAttackIncreasedNegated = 42,
+            AreaBuffEachSecond = 51,
+            AreaBuffOnAlliesEachSecond = 52
         }
 
         public enum Type107 : byte
diff --git a/src/NosCore.GameObject/Services/SpeedCalculationService/SpeedCalculationService.cs b/src/NosCore.GameObject/Services/SpeedCalculationService/SpeedCalculationService.cs
index 6e1237e81..5df15dfaf 100644
--- a/src/NosCore.GameObject/Services/SpeedCalculationService/SpeedCalculationService.cs
+++ b/src/NosCore.GameObject/Services/SpeedCalculationService/SpeedCalculationService.cs
@@ -18,7 +18,12 @@ private byte CalculateSpeed(IAliveEntity aliveEntity, byte defaultSpeed)
             //        return 0;
             //    }
 
-            var bonusSpeed = 0; /*(byte)GetBuff(CardType.Move, (byte)AdditionalTypes.Move.SetMovementNegated)[0];*/
+            // The movement BCards are still not read. The placeholder that used to sit
+            // here reached for subtype 32, which the files say is "movement speed is
+            // DECREASED by %s while you are hidden": wrong slot and wrong condition for a
+            // general speed bonus. The unconditional flat pair is 41-42, and 21-22 is the
+            // percentage.
+            var bonusSpeed = 0;
             if (defaultSpeed + bonusSpeed > 59)
             {
                 return 59;