This table shows the health and attack by dungeon difficulty of every boss (although at Hard difficulty, it shows "reference" statistics -- boss statistics vary wildly in Hard dungeons; for example, Grimm's Grotto significantly boosts health and damage, Doubledoom slightly depresses them, and Hexx Ruins, though nominally Hard, uses the Normal statistics):
| Boss |  Normal |    |  Hard |    |  Vicious |    | Location(s) | 
|  Aequitas (Northern Desert) | 
 75  159
 | 
 120  318
 |  |  |  |  | Northern Desert | 
|  Aequitas | 
 112  318
 | 
 180  636
 | 
 135  380
 |  | 
 135  380
 |  | Random, Naga City | 
|  Bleaty | 
 225  159
 | 
 360  318
 | 
 270  190
 | 
 360  318
 |  |  | Random | 
|  The Firstborn | 
 75  477
 |  | 
 90  570
 |  | 
 105  666
 | 
 120  954
 | Random, Dragon Isles | 
|  Frank the Zombie | 
 75  636
 |  | 
 90  760
 |  | 
 90  760
 |  | Random, Naga City | 
|  The Iron Man | 
 75  318
 |  | 
 90  380
 |  | 
 90  380
 |  | Random, Naga City | 
|  Jörmungandr | 
 75  318
 |  | 
 90  380
 |  | 
 90  380
 |  | Random, Southern Swamp, Naga City | 
|  Lord Gobb | 
 90  318
 |  | 
 108  380
 |  | 
 108  380
 | 
 144  636
 | Random, Naga City | 
|  Medusa | 
 75  190
 |  | 
 90  228
 |  |  |  | Random | 
|  Super Meat Man | 
 48  954
 |  | 
 58  1140
 | 
 77  1908
 | 
 58  1140
 | 
 77  1908
 | Random, The Slime Pit, Naga City | 
|  Tomithy Longdall | 
 52  238
 | 
 84  477
 | 
 62  285
 | 
 84  477
 | 
 62  285
 |  | Random, Naga City | 
|  Tormented One | 
 75  238
 |  | 
 90  285
 |  | 
 90  285
 | 
 120  477
 | Random, Naga City | 
|  Tower of Goo | 
 75  318
 | 
 120  636
 | 
 90  380
 | 
 120  636
 | 
 90  380
 |  | Random, Northern Desert, The Slime Pit, Naga City | 
|  Count Blahblah | 
 75  397
 | 
 120  795
 |  |  | 
 120  1110
 | 
 137  1590
 | Eastern Tundra, Vicious Steel | 
|  Getanadafix | 
 75  477
 | 
 120  954
 |  |  |  |  | Western Jungle | 
|  Anoobis (1/3) |  |  | 
 102  174
 |  |  |  | Creeplight Ruins | 
|  Anoobis (2/3) |  |  |  |  |  |  | Creeplight Ruins | 
|  Anoobis (3/3) |  |  |  |  |  |  | Creeplight Ruins | 
|  Bjôrn Ulfhéôinn |  |  | 
 75  198
 | 
 120  397
 |  |  | Berserker Camp | 
|  Curse Shade |  |  | 
 60  159
 |  |  |  | Cursed Oasis | 
|  Cursed Dragon |  |  | 
 86  546
 |  |  |  | Cursed Oasis | 
|  Evolvia |  |  | 
 97  412
 |  |  |  | Shifting Passages | 
|  Earth Guardian |  |  | 
 75  238
 |  |  |  | Rock Garden | 
|  Stone Guardian |  |  | 
 75  238
 |  |  |  | Rock Garden | 
|  Herp |  |  | 
 97  515
 |  |  |  | Magma Mines | 
|  Hurr |  |  | 
 97  206
 |  |  |  | Magma Mines | 
|  Durr |  |  | 
 97  206
 |  |  |  | Magma Mines | 
|  The Indomitable |  |  | 
 62  190
 | 
 83  318
 | 
 73  222
 | 
 83  318
 | Halls of Steel, Vicious Steel | 
|  Itsssamna |  |  | 
 45  380
 | 
 60  636
 |  |  | Ick Swamp | 
|  Rex |  |  | 
 82  412
 |  |  |  | The Labyrinth | 
|  Stheno |  |  | 
 75  238
 | 
 120  477
 |  |  | Hexx Ruins | 
|  Zin Kibaru |  |  | 
 78  415
 |  |  |  | Havendale Bridge |