Calamity is a mod for Terraria. Terraria is a exploration game where you have to fight to survive and ungrade your self slowly to fight bosses to get better gear.
Your journy starts with your fight against Desert Scourge. He is not a hard boss to beat but he does provide a starting challenge. Quote from lore item "The great sea worm appears to have survived the extreme heat and has even adapted to it. What used to be a majestic beast swimming through the water has now become a dried-up and gluttonous husk, constantly on a voracious search for its next meal."
Crabulon
There is not much known about this boss other than it is a giant crab with mushrooms on it. Its lore item says "A crab and its mushrooms, a love story.It's interesting how creatures can adapt given certain circumstances."
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The hive Mind can be fought at any time in the game. It is part of the curroption which is like a virus. Its lore Item states " A hive of clustered microbial-infected flesh. I do not believe killing it will lessen the corruption here."
The Perforators
The Perforators are the counter part to the Hive Mind. They part of the crimson which is a flesh like desise that spreads. Its lore item states "An abomination of comingled flesh, bone, and organ, infested primarily by blood-slurping worms. The chunks left over from the brain must have been absorbed by the crimson and reconstituted into it."
The Slime God
The Slime God is a mixture of the slimes from the crimson and corruption. Its lore item says "It is a travesty, one of the most threatening biological terrors ever created. If this creature were allowed to combine every slime on the planet it would become nearly unstoppable."
Wall of Flesh
The Wall of Flesh a summoned by killing guide by throwing his voodoo doll in lava. It says the wall of flesh is said to be full of hatered. Its lore item says " I see the deed is done. The unholy amalgamation of flesh and hatred has been defeated. Prepare to face the terrors that lurk in the light and dark parts of this world."
That is all the bosses in pre hard mode.
Cryogen is the prison of Permifrost. We dont know why the archmage was imprisoned. The lore item states " The archmage's prison. I am unsure if it has grown weaker over the decades of imprisonment."
The Aquatic Scourge is the mutated version of the Desert Scourge. It is fought in the Sulphurous Sea. the lore item says "Aquatic Scourge A horror born of pollution and insatiable hunger; based on size alone this was merely a juvenile. These scourge creatures are the largest aquatic predators and very rarely do they frequent such shallow waters."
Brimstone Elemental
The Brimstone Elemental is fought in the brimstone crag. Its lore item says "The most powerful of the elementals, bent on exacting revenge upon the bloody inferno that demolished her home. Finally put to rest, she will suffer no longer from the grief caused by the deaths of her people."
Calamitas Clone
Calamitas clone is the failed clone of Calamitas. Its lore item says " You are indeed stronger than I thought. Though the bloody inferno still lingers, observing your progress."
One is a young lady while the other is a monster of the sea. Its lore item says " An odd pair of creatures; one seeking companionship and the other seeking sustenance. Perhaps two genetic misfits outcast from their homes that found comfort in assisting one another."
Astrum Aureus
Astrum Aureus is found in the Astral infection biome which appears after you beat the wall of flesh. A titanic cyborg infected by a star-borne disease expelled from the belly of an ancient god. The destruction of this creature will not prevent the spread of the disease.
The Plaguebringer Goliath is thoriezed to be a experimented queen bee. Its lore item states "A horrific amalgam of steel, flesh, and infection, capable of destroying an entire civilization in just one onslaught. Its plague nuke barrage can leave an entire area uninhabitable for months. A shame that it came to this but the plague must be contained."
The Ravanger is an amougimation of flesh and evil created to stop people. The lore item says "The flesh golem constructed using twisted necromancy during the time of my conquest to counter my unstoppable forces. Its creators were slaughtered by it moments after its conception. It is for the best that it has been destroyed."
Astrum Deus
Astrum Deus was once a god but was struck down. The lore item says "God of the stars and largest vessel for the Astral Infection. Though struck down from its place among the stars its remnants have gathered strength, aiming to take its rightful place in the cosmos once more."