diff --git a/Bosses.py b/Bosses.py
index df561fb3..70932602 100644
--- a/Bosses.py
+++ b/Bosses.py
@@ -238,23 +238,17 @@ def place_bosses(world, player: int):
                 place_boss(world, player, boss, loc, level)
 
     elif world.boss_shuffle[player] == "singularity":
-        boss = world.random.choice(anywhere_bosses)
-        for loc, level in boss_locations:
-            place_boss(world, player, boss, loc, level)
-
-    elif world.boss_shuffle[player] == "duality":
-        # pick a boss that can only appear in some places
-        limited_boss = world.random.choice([boss for boss in placeable_bosses if boss not in anywhere_bosses])
-
+        primary_boss = world.random.choice(placeable_bosses)
         remaining_boss_locations = []
         for loc, level in boss_locations:
-            #place that boss where it can go
-            if can_place_boss(world, player, limited_boss, loc, level):
-                place_boss(world, player, limited_boss, loc, level)
+            # place that boss where it can go
+            if can_place_boss(world, player, primary_boss, loc, level):
+                place_boss(world, player, primary_boss, loc, level)
             else:
                 remaining_boss_locations.append((loc, level))
-        #pick a boss to go into the remaining locations
-        remaining_boss = world.random.choice([boss for boss in placeable_bosses if all(
-            can_place_boss(world, player, boss, loc, level) for loc, level in remaining_boss_locations)])
-        for loc, level in remaining_boss_locations:
-            place_boss(world, player, remaining_boss, loc, level)
+        if remaining_boss_locations:
+            # pick a boss to go into the remaining locations
+            remaining_boss = world.random.choice([boss for boss in placeable_bosses if all(
+                can_place_boss(world, player, boss, loc, level) for loc, level in remaining_boss_locations)])
+            for loc, level in remaining_boss_locations:
+                place_boss(world, player, remaining_boss, loc, level)
diff --git a/EntranceRandomizer.py b/EntranceRandomizer.py
index b47a5f10..263d9c23 100755
--- a/EntranceRandomizer.py
+++ b/EntranceRandomizer.py
@@ -292,7 +292,7 @@ def parse_arguments(argv, no_defaults=False):
     parser.add_argument('--skip_playthrough', action='store_true', default=defval(False))
     parser.add_argument('--enemizercli', default=defval('EnemizerCLI/EnemizerCLI.Core'))
     parser.add_argument('--shufflebosses', default=defval('none'), choices=['none', 'basic', 'normal', 'chaos',
-                                                                            "singularity", "duality"])
+                                                                            "singularity"])
     parser.add_argument('--shuffleenemies', default=defval('none'),
                         choices=['none', 'shuffled', 'chaos', 'chaosthieves'])
     parser.add_argument('--enemy_health', default=defval('default'),
diff --git a/Gui.py b/Gui.py
index 16ca9d06..02051760 100755
--- a/Gui.py
+++ b/Gui.py
@@ -385,7 +385,7 @@ def guiMain(args=None):
     enemizerBossVar = StringVar()
     enemizerBossVar.set('none')
     enemizerBossOption = OptionMenu(enemizerBossFrame, enemizerBossVar, 'none', 'basic', 'normal', 'chaos',
-                                    "singularity", "duality")
+                                    "singularity")
     enemizerBossOption.pack(side=LEFT)
 
     enemizerDamageFrame = Frame(enemizerFrame)
diff --git a/Mystery.py b/Mystery.py
index cb82af83..ca33c987 100644
--- a/Mystery.py
+++ b/Mystery.py
@@ -331,7 +331,7 @@ def roll_settings(weights):
                          'full': 'normal',
                          'random': 'chaos',
                          'singularity': 'singularity',
-                         'duality': 'duality'
+                         'duality': 'singularity'
                          }[get_choice('boss_shuffle', weights)]
 
     ret.shuffleenemies = {'none': 'none',