Hardened dragon bones: where to get it

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Source	Quantity	Chance per roll
Basilisk []	45–55	1/2,097,152
Berry []	45–55	1/3,355,443.2
Berserk barbarian spirit []	45–55	1/8,060,928
Black demon []	45–55	1/174,908.42
Black demon []	45–55	1/174,908.42
Black dragon []	45–55	1/237,853.24
Black dragon (Dragonkin Laboratory) (Normal mode) []	45–55	1/153,600
Black Guard (Forgiveness of a Chaos Dwarf) []	45–55	1/16,777,216
Black Guard (Dwarven Mine entrance) []	45–55	1/16,777,216
Black Guard Berserker []	45–55	1/16,777,216
Black Guard crossbowdwarf []	45–55	1/16,777,216
Black Heather []	45–55	1/8,388,608
Black Knight []	45–55	1/5,592,405.33
Black Knight []	45–55	1/3,303,014.4
Black Knight champion []	45–55	1/3,250,585.6
Black stone dragon (Normal mode) []	45–55	1/153,600
Black Stone Scuttler (Normal mode) []	45–55	1/153,600
Bladed muspah []	45–55	1/153,600
Blissful shadow []	45–55	1/4,423,680
Blood nihil []	45–55	1/102,400
Blood reaver []	45–55	1/5,592,405.33
Blood reaver []	45–55	1/3,250,585.6
Bloodveld []	45–55	1/2,097,152
Bloodveld []	45–55	1/2,097,152
Bloodveld []	45–55	1/3,303,014.4
Blue dragon []	45–55	1/3,355,443.2
Boggoth (Normal mode) []	45–55	1/153,600
Boris []	45–55	1/67,108,864
Bork []	45–55	Very rare
Borrokar []	45–55	1/67,108,864
Bossy McBossFace (Normal mode) []	45–55	1/153,600
Bronze dragon []	45–55	1/237,853.24
Brutal green dragon []	45–55	1/199,919.16
Brutish dinosaur []	45–55	1/102,400
Bulbous crawler []	45–55	Very rare
Butcher demon []	45–55	1/3,171,942.4
Cabbagemancer []	45–55	1/1,198,372.57
Cadarn magus []	45–55	1/256,000
Cadarn ranger []	45–55	1/256,000
Camel Warrior []	45–55	1/102,400
Catablepon []	45–55	1/6,619,136
Cave bug []	45–55	1/3,355,443.2
Cave crawler []	45–55	1/16,777,216
Cave crawler []	45–55	1/5,592,405.33
Cave horror []	45–55	1/204,800, 3 rolls
Cave slime []	45–55	1/4,194,304
Celestial dragon (Dragonkin Laboratory) (Normal mode) []	45–55	1/153,600
Champion of Infernus []	45–55	1/3,250,585.6