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Challenge Rating 18
All 26 monsters with Challenge Rating 18 in the Onyx D&D 5e bestiary.
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Adult Time Dragon
Amnizu
Ancient Deep Dragon
Archaic
Asteria
Avatar of Baalzebul
Awful Fisher
Beanstalk Wurm
Borborygmos
Citadel Spider
Cosmic Horror
Demilich
Drow Favored Consort
Euryale
Fire Giant Forgecaller
Hollow Dragon
Lichen Lich
Malaxxix
Olhydra
Sibriex
The Lord of Blades
Trostani
Waeloquay
Walking Statue of Waterdeep
Yan-C-Bin
Zlan