I hate this gun and I hate these riddle-like trial descriptions so if you're trying to speedrun this gun I gotchu. Sidenote, why does this not exist literally anywhere? All I could find after looking for like an hour was the Calamity Overhaul Chinese wiki which is not fun to translate. Obtaining the Halibut Cannon Honestly I just fished it up on accident and have since gotten like 50 billion of them. It also drops from the Primordial Wyrm apparently, but that's the last boss in the entire game so idk ¯ _(ツ)_/¯ Things to Note You can fight these bosses out of order. Like if, for some reason, you've defeated Skeletron & WoF already, but haven't defeated Queen Bee yet, the Halibut Cannon will stay on Trial 3 (Queen Bee) but after defeating her will jump to Trial 5 (Mech Bosses/Aquatic Scourge). Basically it'll skip over whatever trials you've already completed. Also I'll include the Trial dialogue text another day I cba rn. Trial 1: King Slime Ways to Spawn: Natural--King Slime will randomly spawn in naturally during/after the "Slime is Falling from the Sky!" event. Item--You can spawn him in by using the Slime Crown item. Trial 2: Eye of Cthulhu Ways to Spawn: Natural--The eye will randomly spawn in naturally at night if it hasn't been defeated yet. Item--You can spawn it in by using a Suspicious Eye (very easy to find underground) at night. Trial 3: Queen Bee Ways to Spawn: Natural-- She will spawn if the player destroys one of her larva things, found in beehive structures in the underground jungle. Item--You can spawn her in by using the Abeemination item. Trial 4: Skeletron & WoF Skeletron Ways to Spawn: Natural--You can summon Skeletron by going to the dungeon at night and talking to the Old Man NPC, Item--You can summon Skeletron by killing the Clothier by using a Clothier Voodoo Doll at night. Wall of Flesh Ways to Spawn: Naturally--You can summon WoF by going to hell and throwing a Guide Voodoo Doll into lava. The voodoo doll is relatively easy to get, just kill one of the flying demons with a tail. Item--There is no item to summon WoF. Trial 5: Any Mech Boss OR Aquatic Scourge The Destroyer Ways to Spawn: Naturally--The Destroyer will randomly spawn in naturally at night after WoF has been defeated. Item-- You can summon The Destroyer by using the Mechanical Worm item at night. The Twins Ways to Spawn: Naturally--The Twins will randomly spawn in naturally at night after WoF has been defeated. Item--You can summon The Twins by using the Mechanical Eye item at night. Skeletron Prime Ways to Spawn: Naturally--Skeletron Prime will randomly spawn in naturally at night after WoF has been defeated. Item--you can summon Skeletron Prime by using the Mechanical Skull item at night. Aquatic Scourge Ways to Spawn: Naturally--The Aquatic Scourge will randomly spawn in naturally in the Sulphurous Sea (very rare). Item--You can summon the Aquatic Scourge by using the Seafood item in the Sulphurous Sea. Trial 6: Calamitas Clone OR Plantera Calamitas Clone Ways to Spawn: Naturally--Calamitas Clone cannot spawn naturally. Item--You can summon Calamitas with an Eye of Desolation at night. Plantera Ways to Spawn: Naturally--You can summon Plantera by destroying one of the flower bulbs in the underground jungle. Item--There is no item to summon Plantera (unless further modded). Trial 7: Golem Ways to Spawn: Naturally--You can summon Golem by first finding the jungle temple in the underground jungle and using a Lihzahrd Power Cell at the Lihzahrd Altar in said temple. Item--There is no item to spawn Golem. Trial 8: Moon Lord Ways to Spawn: Natural--You can summon Moon Lord by first defeating the Lunatic Cultist and then destroying all four Celestial Pillars found around the surface of the map. Wherever the last pillar is that you destroy is where Moon Lord will spawn. Item--You can use the Celestial Sigil to spawn him in. Trial 9: Providence, the Profaned Goddess Ways to Spawn: Naturally--Providence cannot spawn naturally. Item--You can spawn in Providence by using the Profaned Core item in the Hallow or Underground. Trial 10: Polterghast Ways to Spawn: Naturally--Polterghast will spawn if the player kills 30 Phantom Spirits in the Dungeon. Item--You can summon Polterghast by using the Necroplasmic Beacon in the Dungeon. Trial 11: The Devourer of Gods Ways to Spawn: Naturally--DoG cannot spawn in naturally. Item--You can summon DoG by using the Cosmic Worm item anywhere in your world. Trial 12: Yharon, Dragon of Rebirth Ways to Spawn: Naturally--Yharon will not spawn in naturally. Item--You can summon Yharon by using the Blessed Phoenix Egg item anywhere in your world. Trial 13: Exo Mechs & Supreme Witch, Calamitas Exo Mechs Ways to Spawn: Naturally--The Exo Mechs will not spawn naturally. Item--You can summon the Exo Mechs by pressing the Contact button on a completed Codebreaker. Supreme Witch, Calamitas Ways to Spawn: Naturally--Supreme Calamitas will not spawn in naturally. Though, you can spawn her in by defeating Calamitas Clone and choosing to draw your weapon when prompted. Item--You can summon Supreme Calamitas by using Ashes of Calamity or a Ceremonial Urn at an Alter of the Accursed. Trial 14: Primordial Wyrm Ways to Spawn: Naturally--The Primordial Wyrm will not spawn naturally. Item--You can summon the Primordial Wyrm by giving yourself the Chaos State debuff (Rod of Discord, Normality Relocator, etc.) in the Abyss (or near the Abyss as I learned the hard way).