diff --git a/Bosses.py b/Bosses.py
index 70464da8..b2e0dcaa 100644
--- a/Bosses.py
+++ b/Bosses.py
@@ -119,6 +119,8 @@ boss_table = {
     'Agahnim2': ('Agahnim2', AgahnimDefeatRule)
 }
 
+anywhere_bosses = ["Moldorm", "Helmasaur King", "Mothula", "Vitreous"]
+
 def can_place_boss(world, player, boss, dungeon_name, level=None):
     if world.swords[player] in ['swordless'] and boss == 'Kholdstare' and dungeon_name != 'Ice Palace':
         return False
@@ -178,7 +180,7 @@ def place_bosses(world, player):
             ['Inverted Ganons Tower', 'bottom'],
         ]
 
-    all_bosses = sorted(boss_table.keys()) #s orted to be deterministic on older pythons
+    all_bosses = sorted(boss_table.keys()) #sorted to be deterministic on older pythons
     placeable_bosses = [boss for boss in all_bosses if boss not in ['Agahnim', 'Agahnim2', 'Ganon']]
 
     if world.boss_shuffle[player] in ["basic", "normal"]:
@@ -194,7 +196,7 @@ def place_bosses(world, player):
         else: # all bosses present, the three duplicates chosen at random
             bosses = all_bosses + [world.random.choice(placeable_bosses) for _ in range(3)]
 
-        logging.getLogger('').debug('Bosses chosen %s', bosses)
+        logging.debug('Bosses chosen %s', bosses)
 
         world.random.shuffle(bosses)
         for [loc, level] in boss_locations:
@@ -204,7 +206,7 @@ def place_bosses(world, player):
                 raise FillError('Could not place boss for location %s' % loc_text)
             bosses.remove(boss)
 
-            logging.getLogger('').debug('Placing boss %s at %s', boss, loc_text)
+            logging.debug('Placing boss %s at %s', boss, loc_text)
             world.get_dungeon(loc, player).bosses[level] = BossFactory(boss, player)
     elif world.boss_shuffle[player] == "chaos": #all bosses chosen at random
         for [loc, level] in boss_locations:
@@ -215,5 +217,26 @@ def place_bosses(world, player):
             except IndexError:
                 raise FillError('Could not place boss for location %s' % loc_text)
 
-            logging.getLogger('').debug('Placing boss %s at %s', boss, loc_text)
+            logging.debug('Placing boss %s at %s', boss, loc_text)
             world.get_dungeon(loc, player).bosses[level] = BossFactory(boss, player)
+    elif world.boss_shuffle[player] == "singularity":
+        if world.swords[player] == 'swordless':
+            boss = world.random.choice(anywhere_bosses)
+        else:
+            boss = world.random.choice(anywhere_bosses + ["Kholdstare"])
+        for [loc, level] in boss_locations:
+            logging.debug('Placing boss %s at %s', boss, loc + (' ('+level+')' if level else ''))
+            world.get_dungeon(loc, player).bosses[level] = BossFactory(boss, player)
+    elif world.boss_shuffle[player] == "duality":
+        if world.swords[player] == 'swordless':
+            used_anywhere_bosses = anywhere_bosses
+        else:
+            used_anywhere_bosses = anywhere_bosses + ["Kholdstare"]
+
+        limited_boss = world.random.choice([boss for boss in placeable_bosses if boss not in used_anywhere_bosses])
+        anywhere_boss = world.random.choice(used_anywhere_bosses)
+
+        for [loc, level] in boss_locations:
+            boss = limited_boss if can_place_boss(world, player, limited_boss, loc, level) else anywhere_boss
+            logging.debug('Placing boss %s at %s', boss, loc + (' ('+level+')' if level else ''))
+            world.get_dungeon(loc, player).bosses[level] = BossFactory(boss, player)
\ No newline at end of file
diff --git a/EntranceRandomizer.py b/EntranceRandomizer.py
index ef2f53aa..d207e148 100755
--- a/EntranceRandomizer.py
+++ b/EntranceRandomizer.py
@@ -290,7 +290,8 @@ def parse_arguments(argv, no_defaults=False):
                         help="Skip Multiworld Progression balancing.")
     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'])
+    parser.add_argument('--shufflebosses', default=defval('none'), choices=['none', 'basic', 'normal', 'chaos',
+                                                                            "singularity", "duality"])
     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 a251be0f..46826409 100755
--- a/Gui.py
+++ b/Gui.py
@@ -384,7 +384,8 @@ def guiMain(args=None):
     enemizerBossLabel.pack(side=LEFT)
     enemizerBossVar = StringVar()
     enemizerBossVar.set('none')
-    enemizerBossOption = OptionMenu(enemizerBossFrame, enemizerBossVar, 'none', 'basic', 'normal', 'chaos')
+    enemizerBossOption = OptionMenu(enemizerBossFrame, enemizerBossVar, 'none', 'basic', 'normal', 'chaos',
+                                    "singularity", "duality")
     enemizerBossOption.pack(side=LEFT)
 
     enemizerDamageFrame = Frame(enemizerFrame)
diff --git a/Mystery.py b/Mystery.py
index c8c58102..c93b287b 100644
--- a/Mystery.py
+++ b/Mystery.py
@@ -329,7 +329,9 @@ def roll_settings(weights):
     ret.shufflebosses = {'none': 'none',
                          'simple': 'basic',
                          'full': 'normal',
-                         'random': 'chaos'
+                         'random': 'chaos',
+                         'singularity': 'singularity',
+                         'duality': 'duality'
                          }[get_choice('boss_shuffle', weights)]
 
     ret.shuffleenemies = {'none': 'none',
diff --git a/easy.yaml b/easy.yaml
index 22eb1209..f6290e6f 100644
--- a/easy.yaml
+++ b/easy.yaml
@@ -147,6 +147,8 @@ boss_shuffle:
   simple: 0 # Existing bosses except Ganon and Agahnim are shuffled throughout dungeons
   full: 0 # 3 bosses can occur twice
   random: 0 # Any boss can appear any amount of times
+  singularity: 0 # picks any boss that can appear anywhere and puts that boss into every arena
+  duality: 0 # picks a boss that can only appear in some places and a boss that can appear anywhere, then attempts to put both in that order in every arena
 enemy_shuffle:
   none: 1 # Vanilla enemy placement
   chaos: 0 # Enemies are randomized