Challenge rating 21 monsters
4 SRD monsters at CR 21. Each is worth 33,000 XP and has a +7 proficiency bonus; on average they have AC 20.3 and 274 hit points.
How hard is one CR 21 monster?
With the 2024 encounter budgets (SRD 5.2), a single CR 21 monster fits each difficulty for a party of four from:
| Difficulty | Party level |
|---|---|
| Low | beyond 20th level |
| Moderate | 18th level and up |
| High | 16th level and up |
More monsters add up: the budget counts every monster’s XP. Mix and match in the encounter calculator.
All CR 21 monsters
| Monster | Type | Size | AC | HP |
|---|---|---|---|---|
| Ancient Black Dragon | Dragon | Gargantuan | 22 | 367 |
| Ancient Copper Dragon | Dragon | Gargantuan | 21 | 350 |
| Lich | Undead | Medium | 17 | 135 |
| Solar | Celestial | Large | 21 | 243 |