Now the player has to kill the fake M'Brin in 'Choice in the Fog'...

...instead of just attacking once, but on difficulties other than hard
he's also nerfed by -2 damage and -20 HP.

data/campaigns/The_South_Guard/scenarios/05_Choice_In_The_Fog.cfg

@@ -135,12 +135,7 @@
         {INCOME 3 5 6}
 
         canrecruit=1
-        [ai]
-            recruitment_pattern=fighter,archer
-            {QUANTITY aggression 0.2 0.4 0.6}
-            {NO_SCOUTS}
-            {ATTACK_DEPTH 3 4 5}
-        [/ai]
+
 #ifdef EASY
         recruit=Skeleton, Skeleton Archer, Ghoul
 #endif
@@ -150,6 +145,34 @@
 #ifdef HARD
         recruit=Skeleton, Revenant, Deathblade, Skeleton Archer, Bone Shooter, Ghoul
 #endif
+
+        [ai]
+            recruitment_pattern=fighter,archer
+            {QUANTITY aggression 0.2 0.4 0.6}
+            {NO_SCOUTS}
+            {ATTACK_DEPTH 3 4 5}
+        [/ai]
+
+        # On hard, the fake M'Brin is a normal lich, on other difficulties he's
+        # weaker
+
+#ifndef HARD
+        [modifications]
+            [object]
+                silent=yes
+
+                [effect]
+                    apply_to=attack
+                    increase_damage=-2
+                [/effect]
+
+                [effect]
+                    apply_to=hitpoints
+                    increase_total=-20
+                [/effect]
+            [/object]
+        [/modifications]
+#endif
     [/side]
 
     # Scenario Start
@@ -645,16 +668,11 @@
     # Someone attacks Mal M'brin and he vanishes!
 
     [event]
-        name=attack
-        [filter_second]
-            description="Mal M'brin"
-        [/filter_second]
+        name=die
 
-        [kill]
+        [filter]
             description="Mal M'brin"
-            animate=yes
-            fire_event=no
-        [/kill]
+        [/filter]
 
         [sound]
             name=lightning.ogg
@@ -694,10 +712,6 @@
                 [/endlevel]
             [/then]
             [else]
-                [message]
-                    speaker=unit
-                    message= _ "I struck him and he disappeared! Can I really have killed the Lich?"
-                [/message]
                 [message]
                     description=Sir Gerrick
                     message= _ "We have beaten them both, criminals and undead!"