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Challenge Rating 20
All 21 monsters with Challenge Rating 20 in the Onyx D&D 5e bestiary.
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Ancient Brass Dragon
Ancient Topaz Dragon
Ancient White Dragon
Arveiaturace
Bhaal, Slayer
Devorastus
Drow Matron Mother
Flesh Colossus
Gigant
Grim Champion of Bloodshed
Iggwilv the Witch Queen
Kolyarut
Leviathan
Nightwalker
Ogrémoch
Pit Fiend
Rimmon
Sholeh
Storm Giant Tempest Caller
Styx Dragon
Zagum