diff --git a/data/json/monsters/jabberwock.json b/data/json/monsters/jabberwock.json
index 8404e3127a3fd..1ed75749fbb02 100644
--- a/data/json/monsters/jabberwock.json
+++ b/data/json/monsters/jabberwock.json
@@ -96,6 +96,6 @@
     "special_attacks": [ [ "FLESH_GOLEM", 5 ] ],
     "harvest": "jabberwock",
     "dissect": "dissect_beast_sample_large",
-    "flags": [ "SEES", "HEARS", "SMELLS", "STUMBLES", "WARM", "BASHES", "DESTROYS", "ATTACKMON", "POISON" ]
+    "flags": [ "SEES", "HEARS", "SMELLS", "STUMBLES", "WARM", "BASHES", "DESTROYS", "ATTACKMON", "POISON", "NEVER_WANDER" ]
   }
 ]
diff --git a/data/json/monsters/zed_fusion.json b/data/json/monsters/zed_fusion.json
index 98f75ad77be50..f68fe7dfecb76 100644
--- a/data/json/monsters/zed_fusion.json
+++ b/data/json/monsters/zed_fusion.json
@@ -240,7 +240,7 @@
     "harvest": "exempt",
     "special_attacks": [ { "type": "leap", "cooldown": 5, "max_range": 5, "allow_no_target": true }, [ "scratch", 5 ] ],
     "death_function": { "message": "A %s explodes!", "effect": { "id": "death_gas", "hit_self": true }, "corpse_type": "NO_CORPSE" },
-    "flags": [ "SEES", "HEARS", "SMELLS", "WARM", "POISON", "CLIMBS", "NO_BREATHE", "CLIMBS", "HARDTOSHOOT" ]
+    "flags": [ "SEES", "HEARS", "SMELLS", "WARM", "POISON", "CLIMBS", "NO_BREATHE", "CLIMBS", "HARDTOSHOOT", "NEVER_WANDER" ]
   },
   {
     "id": "mon_zombie_gasbag_impaler",
@@ -316,7 +316,7 @@
     "vision_day": 1,
     "special_attacks": [ { "type": "leap", "cooldown": 5, "max_range": 3, "allow_no_target": true }, [ "scratch", 5 ] ],
     "death_function": { "message": "A %s explodes!", "effect": { "id": "death_gas", "hit_self": true }, "corpse_type": "NO_CORPSE" },
-    "flags": [ "SEES", "HEARS", "GOODHEARING", "WARM", "POISON", "CLIMBS", "NO_BREATHE", "CLIMBS", "HARDTOSHOOT" ]
+    "flags": [ "SEES", "HEARS", "GOODHEARING", "WARM", "POISON", "CLIMBS", "NO_BREATHE", "CLIMBS", "HARDTOSHOOT", "NEVER_WANDER" ]
   },
   {
     "id": "mon_zombie_hanging_innards",
diff --git a/src/monster.cpp b/src/monster.cpp
index 870a0a5cdb9ae..f13e48d889f94 100644
--- a/src/monster.cpp
+++ b/src/monster.cpp
@@ -3390,8 +3390,8 @@ void monster::set_horde_attraction( monster_horde_attraction mha )
 bool monster::will_join_horde( int size )
 {
     const monster_horde_attraction mha = get_horde_attraction();
-    if( this->has_flag( MF_IMMOBILE ) ) {
-        return false; //immobile monsters should never join a horde.
+    if( this->has_flag( MF_IMMOBILE ) || this->has_flag( MF_NEVER_WANDER ) ) {
+        return false; //immobile monsters should never join a horde. Same with Never Wander monsters.
     }
     if( mha == MHA_NEVER ) {
         return false;
diff --git a/src/monstergenerator.cpp b/src/monstergenerator.cpp
index cf9c234706f27..d13e045c77933 100644
--- a/src/monstergenerator.cpp
+++ b/src/monstergenerator.cpp
@@ -201,6 +201,7 @@ std::string enum_to_string<m_flag>( m_flag data )
         case MF_ALWAYS_VISIBLE: return "ALWAYS_VISIBLE";
         case MF_ALWAYS_SEES_YOU: return "ALWAYS_SEES_YOU";
         case MF_ALL_SEEING: return "ALL_SEEING";
+        case MF_NEVER_WANDER: return "NEVER_WANDER";
         // *INDENT-ON*
         case m_flag::MF_MAX:
             break;
diff --git a/src/mtype.h b/src/mtype.h
index 8dd43441de085..3855115abcb9b 100644
--- a/src/mtype.h
+++ b/src/mtype.h
@@ -174,6 +174,7 @@ enum m_flag : int {
     MF_ALWAYS_VISIBLE,      // This monster can always be seen regardless of los or light or anything
     MF_ALWAYS_SEES_YOU,     // This monster always knows where the avatar is
     MF_ALL_SEEING,          // This monster can see everything within its vision range regardless of light or obstacles
+    MF_NEVER_WANDER,        // This monster will never join wandering hordes.
     MF_MAX                  // Sets the length of the flags - obviously must be LAST
 };
 
diff --git a/src/overmap.cpp b/src/overmap.cpp
index ddf0a14f7bb7f..115038fadc785 100644
--- a/src/overmap.cpp
+++ b/src/overmap.cpp
@@ -72,8 +72,6 @@ static const mongroup_id GROUP_SWAMP( "GROUP_SWAMP" );
 static const mongroup_id GROUP_WORM( "GROUP_WORM" );
 static const mongroup_id GROUP_ZOMBIE( "GROUP_ZOMBIE" );
 
-static const mtype_id mon_jabberwock( "mon_jabberwock" );
-
 static const oter_str_id oter_central_lab( "central_lab" );
 static const oter_str_id oter_central_lab_core( "central_lab_core" );
 static const oter_str_id oter_central_lab_train_depot( "central_lab_train_depot" );
@@ -4033,7 +4031,6 @@ void overmap::move_hordes()
             const mtype &type = *this_monster.type;
             if(
                 !type.species.count( species_ZOMBIE ) || // Only add zombies to hordes.
-                type.id == mon_jabberwock || // Jabberwockies are an exception.
                 this_monster.get_speed() <= 30 || // So are very slow zombies, like crawling zombies.
                 !this_monster.will_join_horde( INT_MAX ) || // So are zombies who won't join a horde of any size.
                 !this_monster.mission_ids.empty() // We mustn't delete monsters that are related to missions.