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13 votes
2 answers
653 views

Are NPC Spellcasters with access to Mage Armor generally assumed to have precast it for an encounter in CR calculations?

In about a week I will be throwing a homebrewed CR4 illusionist NPC with an AC of 12 and 15 with Mage Armor at my party. (Essentially a slightly buffed version of the Illusionist on page 214 of Volo's ...
Juoa's user avatar
  • 327
8 votes
1 answer
745 views

Does the Archmage’s challenge rating factor in the buffs from its pre-combat spells?

The statblock for the Archmage contains an interesting footnote: The archmage casts these spells on itself before combat. The three spells are: mage armor, stoneskin, and mind blank. These spells ...
Thomas Markov's user avatar
11 votes
2 answers
2k views

What is the AC equivalent of mirror image?

It is suggested (by the DMG) to account for defensive options by assuming increased AC, e.g. +2 AC for magic resistance. I would like to give some of my monsters the spell mirror image as part of a ...
Anagkai's user avatar
  • 16.6k
14 votes
3 answers
1k views

What is the impact of banishment on CR?

Disclaimer: I know that monster balance is never exact and I don't expect it to be, I'm looking for rough guidelines like they are given in the DMG for many traits. I like to flavor up my monsters ...
Anagkai's user avatar
  • 16.6k
4 votes
1 answer
645 views

How much would Sanctuary affect a monster's CR?

I'm currently designing a Cleric "monster" according to the guidelines in the DMG. So far, the stats are falling short of my expectations, so I've decided that the cleric casts sanctuary on itself ...
Robert's user avatar
  • 12.9k