dave2008
Legend
No, a CR 21 monster should be a challenge for group in the 10-12 lvl range.Right, but a CR 21 creature in 5e is supposed to be a challenge to characters of nearly peak abilities. And granted it's one ability, so that's all I'm able to compare it to.
EDIT: For example, a group of 6 10th lvl pcs has a (deadly) budget of 16,800 XP. A CR 21 monster's adjusted XP is 16,500 (33,000 x .05 per pg 83 of the DMG under "Party Size").
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