I'm not sure that's the complaint.I'm curious, what spell combinations do people think would break the game if you could concentrate on two spells at once? Feel free to use any spell class list, including multiclassing, to answer the question.
So, for us we make sure that anything change we do that lets you do more, also has a balance that lets you do less. So, how about:
You may concentrate on a second spell. If you do so, you make not take the attack action or cast additional spells until you drop concentration on a spell.
My thoughts are, it gives the ability to have a no interaction type of concentration, such as Blur up, as well as something that has your attention and you can use your action on, such as Sunbeam or Telekinesis. But that concentration on those two spells takes up all your mental capacity, so no attacking and no casting other spells. You can still use your action to do other things like dash, or activate the action portion of your concentration spell, like telekinesis.
Feel free to not to.Spellcasters are powerful enough without people inventing reasons/rules to make them more so. I'd never allow this at my table.
Feel free to not to.
Others want NPC Archmages to even begin to come close to what the game has always allowed them to do, and what countless novels have described them doing.
As it is the Archmage NPC is a wet blanket of a stat block. It definitely needs massively more tricks up its sleeve if it is ever going to earn the title "archmage", in my book.
Throwing out the cool-sounding but practically-ribbon ability "Spell Mastery" for something real is a just a small first step.
If you look at the appendix in the Monster Manual you will find that nothing you say is reality.NPCs don't have the same rules, spells, or abilities as PCs, you can make the multiple concentration master Archmage all day.
Nothing can stop the DM from just making stuff up: the Rules Police will not break down anybodies door.If you look at the appendix in the Monster Manual you will find that nothing you say is reality.
Sure we can dismiss every criticism with "just make things up", but let's agree that's not a particularly constructive approach [emoji6]
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This still doesn't help.Nothing can stop the DM from just making stuff up: the Rules Police will not break down anybodies door.