Behind each crypt's fog wall waits one of the Audience. A god hits hard, often for most of a same-level player's health, so the fight is about reading its attacks. Its health grows with its level and with the party: +75% for each extra player.
Gods of the crypts
Crypt 2 · Level 12
Billy Boom
11,534 health solo Heaviest hit 95% of your health 660 XP
Charge and shield bash17%Scissor laser sweep17%Flame-wall balls29%Blaster rocket38%
Crypt 3 · Level 19
Diggy
22,828 health solo Heaviest hit 95% of your health 1,424 XP
Fork rocket barrage28%Mine scatter17%Hole shockwave28%Drill charge28%
Crypt 4 · Level 24
Dr. Turret
41,541 health solo Heaviest hit 95% of your health 1,424 XP
Spinning floor laser24%Flame cones29%Homing mortar29%Finger beams18%
Crypt 5 · Level 27
El'Moustiko
59,301 health solo Heaviest hit 95% of your health 2,164 XP
Rocket burst50%Drink17%Mine and cocoon drops17%Shockwave ball17%
Crypt 6 · Level 33
Sir Catercoaster
84,417 health solo Heaviest hit 90% of your health 2,907 XP
Homing rockets27%Turbo rush18%Hanging mines45%Cocoon egg9%
Crypt 7 · Level 38
The Judgeball
202,056 health solo Heaviest hit 90% of your health 2,907 XP
Mine spin14%Artillery barrage14%Bounce charge43%Leash pillars and laser column14%Shield pillars14%
Crypt 8 · Level 41
Duke Nuker
280,090 health solo Heaviest hit 90% of your health 2,907 XP
Shock rockets25%Mortar barrage13%Flame wall13%Charging bash38%Missiles and ice bars13%
Crypt 9 · Level 43
Gang of Elites
208,926 health solo (all six fighters) Heaviest hit 29% of your health 2,910 XP
TankWizardSniperChampionDemolisher
Crypt 10 · Level 45
Beetle Royale
432,909 health solo Heaviest hit 75% of your health 2,907 XP
Plate breaker43%Egg shotgun14%Laser bar volleys14%Whirlwind14%Mine run14%
Crypt 11 · Level 49
Uncle Jim
669,108 health solo Heaviest hit 95% of your health 5,136 XP
Head laser9%Mine fan18%Gatling spray18%Homing missile55%
Crypt 12 · Level 54
???
2,162,080 health solo (both forms) Heaviest hit 90% of your health 18,309 XP
Fish bosses
Monsters of the fish shrines, the open sea and the frozen lake. Their chests are mostly materials, gold and clothing.
Giant Piranha Shrine · Giant Piranha · Lv 6 
Blue Shark Ashore at a camp spot on the big island (Lv 9+ regions) 
Old Pike Shrine · Old Pike · Lv 14 
Tuna Shrine · Tuna · Lv 24 
Goblin Shark Shrine · Goblin Shark · Lv 32 
Pufferfish Shrine · Pufferfish · Lv 40 
Spidercrab Shrine · Spidercrab · Lv 24 
Albatross Ulf's quest, on Glassmere 
Old Mossjaw Birger's quest, on Glassmere Cryptic bosses
Bigger Cryptic that lead raids, guard events and roam the higher regions. Their drop tables are on their enemy pages.
Warden A Grunt grown huge: the elite that rises late in crypt and outpost sieges, and the pair guarding Merrick's Cloud Temple.