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Challenge Rating 21
All 35 monsters with Challenge Rating 21 in the Onyx D&D 5e bestiary.
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Alustriel Silverhand
Ancient Black Dragon
Ancient Copper Dragon
Ancient Emerald Dragon
Ancient Moonstone Dragon
Ancient Solar Dragon
Arasta
Arcturia
Astral Dreadnought
Atash
Avacyn
Brother Adramalech
Brother Morax
Buer
Burney the Barber
Ezzat
False Lich
Fire Kraken
Gargantua
Greater Star Spawn Emissary
Hutijin
Iona
Isperia
Lich
Moloch
Molydeus
Oracs the Enduring
Pazrodine
Renwick
Rerak
Runic Colossus
Shalai
Solar
Valindra Shadowmantle
Veiled Presence