D&D 5E Vs Vecna battle simulations.


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A challenge rating 26 is a Deadly encounter for a party of four 20th-level PCs. That is a solo threat IMO anyway...

Level 20 Deadly XP Threshold is 12,700 XP
Times four PCs is 50,800 XP
A single monster is a X1 multiplier (at CR 26 Vecna is worth 90,000 XP).
Since 90,000 is definitely greater than 50,800, it is a deadly encounter. 🤷‍♂️
That is only "deadly" with multiple encounters per day. A solo threat would take 75-100% of your daily XP budget. So that is 30,000-40,000 XP* per 20th lvl character. So Vecna is a solo threat to 3, maybe 4, 20th level PCs. Of course that is just by the RAW numbers, what is truly a threat varies by party composition, terrain, and how a monster is played.

*From the Adventure Day XP table in the DMG.

See also: Epic Encounters
 

I am not sure if the Cast and Release thing would be immune to counterspell. Releasing it could still be considered part of casting it.
But, it isn't--the spell has already been cast and is "held" until released.

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So, I cast it, with total cover since Vecna has no line of sight (and can't counterspell), move, and release when the trigger is satisfied.
 

That is only "deadly" with multiple encounters per day. A solo threat would take 75-100% of your daily XP budget. So that is 30,000-40,000 XP* per 20th lvl character. So Vecna is a solo threat to 3, maybe 4, 20th level PCs. Of course that is just by the RAW numbers, what is truly a threat varies by party composition, terrain, and how a monster is played.

*From the Adventure Day XP table in the DMG.
We can discuss this later, but I disagree (could be wrong...?).

For reference, see Combat Encounter Difficulty and Evaluating Encounter Difficulty (DMG p. 82), right before your table. ;)
 



That is only "deadly" with multiple encounters per day. A solo threat would take 75-100% of your daily XP budget. So that is 30,000-40,000 XP* per 20th lvl character. So Vecna is a solo threat to 3, maybe 4, 20th level PCs. Of course that is just by the RAW numbers, what is truly a threat varies by party composition, terrain, and how a monster is played.

*From the Adventure Day XP table in the DMG.

See also: Epic Encounters

It's almost like that whole thing is exceedingly complicated! (I don't think that there's much that can be done about it, either... though I found 4e's 'level-equivalent' monsters to be much, much easier to understand encounter balance than 3e or 5e's CR-systems, and I don't think that is because of 4e's overly balanced balance, either!)
 



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