Boss summoning items and ingredients for them.

Boss Summoning

Smash:
    Troll Idol. 
    Hunter Level 12.

Corallus:
    Has a 2% chance to spawn when player kills Amphibiyte. 
    Amphibiyte spawns inside the Amphibiyte Caves, 
    which can be found on the beaches of the Overworld. 
    Hunter Level 30.

King BamBamBam:
    Explosive Idol in The Nether. 
    Hunter Level 23.

Nethengeic Wither:
    Nethengeic Callstone in The Nether. 
    Hunter Level 65.

Tyrosaur:
    Bloodstone on the Tyrosaur Altar in Precasia.

Skeletal Army:
    Ancient Orb on the Army Block in Precasia.

Rockrider:
    Heavy Boulder on the Rockrider Shrine in Haven.
    
Vinocorne:
    Petals on the Vinocorne Altar in Gardencia.
    
Dracyon:
    Call of the Drake on the Dracyon Altar in L'Borean.

Hive King:
    Hive Chunk on the Hive Spawner in Barathos.

Silverfoot:
    Silvro Coin on the Silverfoot Altar in Iromine.

Kror:
    Boulder Dash on the Kror Altar in Deeplands.

Shadowlord:
    Book of Shadows on the Shadowlord Altar in Abyss.
    
Primordal Five:
    Primordal Dust x9 on the 8 Primordal Lamps and Primordal Shrine in Dustopia.

Elusive:
    Staring Eye on the Illusion Altar in Abyss.

Baroness:
    Bloodstone on the Baroness Altar in Barathos.

Gyro:
    Toy Gyrocopter on the Toy Box in Celeve.

Graw:
    Guardian's Eye on the Graw Altar in Lelyetia.

Crystocore:
    Giant Crystal on the Power Station in Crystevia.

Bane:
    Haunted Idol in the Greckon.

King Shroomus:
    Shroom Stone in the Mysterium.

Four Guardians:
    Voliant Heart on the Guardian Altar in Haven.

MechBot: 
    Bloodstone on the MechBot Altar in Iromine.

C.R.E.E.P:
    Explosive Gems on the Greep Altar in Creeponia.

Clunkhead:
    Mega Rune Stone on the Clunkhead Altar in Runandor.

Cotton Candor:
    Treat Bag on the Candy Block in Candyland.

Visualent:
    Observing Eye on the Visualent Altar in Lunalus.
    
Voxxulon:
    Vile Stone on the Voxxulon Altar in Vox Ponds.

Craexxeus:
    Ancient Ring on the Craexxeus Altar in Shyrelands.


A few notes:
    Tyrosaur, Baroness and MechBot will drop nothing.
    Cotton Candor immune to all damage except damage from basic staves: 
    Wind, Water, Fire, Poison, Wither and Noxious Staff 
    (depends on it's current bottom color).


Ancient Cavern Bosses

Coniferon:
    Selyan Shrine, 71 lvl Augury & Infusion.

Horon: 
    Luxon Shrine, 71 lvl Augury & Runation.

Penumbra:
    Erebon Shrine, 71 lvl Augury & Hunter.

Goldorth:
    Pluton Shrine, 71 lvl Augury & Foraging.


Ingredients for boss summoning items

Troll Idol:
    Desert Shell dropped from Sand Golem.
    Rammerhead Hide dropped from Rammerhead.

Explosive Idol:
    Dropped from Diocus in the Precasian Undeground Den.

Nethengeic Callstone:
    Dropped from Nethengeic Beast in the Nethengeic Pits.

Ancient Orb:
    Dropped from Kaiyu in the Kaiyu Temple.

Heavy Boulder:
    Dropped from Terradon in the Precasia.

Petals:
    Crafted at Petal Crafting Station from 5 different flower petals.
    Small Petals dropped from Gardencia mobs.

Call of the Drake:
    Pure Rain Stone dropped from the Coralon.
    Pure Water Stone dropped from the Sea Viper.
    Pure Coral Stone dropped from the Amphibior.

Hive Chunk:
    Dropped from Parasects in the Barathos.

Silvro Coin:
    Bought from the Professor.

Boulder Dash:
    Crafted at the Charging Table from the Heavy Boulder and Primordal Dust.
    
Book of Shadows
    Dropped from the Apparition, Web Reaper and Shade.

Primordal Dust:
    Bought from the Primordal Merchant.

Staring Eye:
    Dropped from Flesh Eater in the Flesh Temple.

Toy Gyrocopter:
    Bought from the Toy Merchant.

Guardian's Eye:
    Dropped from Lelyetian Warriors and Lelyetian Casters.

Giant Crystal:
    Bought from the Crystal Trader.

Haunted Idol:
    Darkly Powder is dropped from the Faceless Floater.
    Ghoulasm dropped from the Sugarface.
    Primed Ghoulasm is obtained by converting Ghoulasm at the Haunting Table.

Shroom Stone:
    Dropped from the Fungik, Fungback and Fungung.

Voliant Heart:
    Dropped from the Voliant. Voliant is rare mob that spawns in Haven.
    Also have a chance to spawn after death of the Volar.

Mega Rune Stone:
    Mega Rune Fragments dropped from the Bouncer, Eye Creature, 
    Paladin and Runicorn.

Treat Bag:
    Spearmint Candy dropped from the Spearmint Slug.
    Peppermint Candy dropped from the Peppermint Slug.
    Gingerbread Coookie dropped from the Gingerbread Man.
    Candy Cane dropped from the Cane Bug.
    Sour Pop dropped from the Cherry Blaster.
    Gingerbread Wind dropped from the Gingerbread Bird.
    Sour Gummy dropped from the Airhead.
    Candy Corn dropped from the Candy Corny.
    Sour Candy dropped from the Cherry Barrager.

Observing Eye:
    Dropped from the Visulon. Visulon is rare mob that spawns in the Lunalus.

Vile Stone:
    Obtained by charging Uncharged Stone at the Enigma Station.
    Uncharged Orb is dropped from Dweller in the Deeplands.

Ancient Ring:
    Obtained from the Shyregem and Shyrestone Ingot
    with a chance at the Ancient Altar.
