D&D 5E Magic Resistance: What was Old is New

That works pretty well, but I'm concerned about the interaction with AC. Taking my drow warriors up-thread as an example (with +2 plate/+3 shield and 25 AC), a +10 gives them a 35 AC, making them immune to any spell attack that's not a natural 20 (natural character max is +15 to hit with a tome and a +3 item at level 20). That seems a bit much, and it's going to make high-AC enemies such as dragons outright immune instead of resistant.
 

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@dave2008

Version 3 seems simply enough but the +8 in the same stat block is VERY powerful if I am reading it right. +8 to AC vs. spell attacks and +8 to all magical saves???

Given the typical max spell save DC is 19, and it would make the AC 30 vs spell attacks, +8 is nearly immune, right?

Was this sample supposed to be so over the top?
 

That works pretty well, but I'm concerned about the interaction with AC. Taking my drow warriors up-thread as an example (with +2 plate/+3 shield and 25 AC), a +10 gives them a 35 AC, making them immune to any spell attack that's not a natural 20 (natural character max is +15 to hit with a tome and a +3 item at level 20). That seems a bit much, and it's going to make high-AC enemies such as dragons outright immune instead of resistant.
I want to be clear this would be used sparingly and the numbers would probably be lower. I haven't adjust the math after switching to the modifier to a save approach. Also, dragon's don't have magic resistance (in current WotC design) so this wouldn't impact them at all. Regardless, I need to look at the math more deeply before I implement this.
 

@dave2008

Version 3 seems simply enough but the +8 in the same stat block is VERY powerful if I am reading it right. +8 to AC vs. spell attacks and +8 to all magical saves???

Given the typical max spell save DC is 19, and it would make the AC 30 vs spell attacks, +8 is nearly immune, right?

Was this sample supposed to be so over the top?
I want to be clear this would be used sparingly and the numbers would probably be lower. I haven't adjusedt the math after switching to the modifier to a save approach. I need to look at the math more deeply before I implement this, so yes the example is off.
 

I want to be clear this would be used sparingly and the numbers would probably be lower. I haven't adjust the math after switching to the modifier to a save approach. Also, dragon's don't have magic resistance (in current WotC design) so this wouldn't impact them at all. Regardless, I need to look at the math more deeply before I implement this.
At least the older dragons likely would have MR in my version. I still remember the magic resistant draconians from Dragonlance Chronicles.
 


Ok, I have posted a revised example. This one has a +4 MR. The idea would be a +1 per 10% of MR. So a +10 should be roughly 100% magic resistance for a high CR monster. Of course since it scales with level/CR that bonus would do less for a low CR monster than it would for a high CR monster. Also, low saves could still be vulnerable even with a +10. Working as intended I think.

That works pretty well, but I'm concerned about the interaction with AC. Taking my drow warriors up-thread as an example (with +2 plate/+3 shield and 25 AC), a +10 gives them a 35 AC, making them immune to any spell attack that's not a natural 20 (natural character max is +15 to hit with a tome and a +3 item at level 20). That seems a bit much, and it's going to make high-AC enemies such as dragons outright immune instead of resistant.

@dave2008

Version 3 seems simply enough but the +8 in the same stat block is VERY powerful if I am reading it right. +8 to AC vs. spell attacks and +8 to all magical saves???

Given the typical max spell save DC is 19, and it would make the AC 30 vs spell attacks, +8 is nearly immune, right?

Was this sample supposed to be so over the top?
 
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Magic missile grant neither a save nor require an attack roll. Is that of any concern?
There are a couple of spells like that (Power Word Kill, etc.) that I need to think about how to address. Any suggestions?

I could just add something like:

A monster's magic resistance can also nullify spells and magical effects that do not typically allow a Saving Throw. In this case, if the monster succeeds on an unmodified saving throw against the caster's or magic effect's spell DC, the magic is nullified for the monster and it has no effect. On a failure the spell works normally.
 
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