Concentration feat/item

[Shiroiken]

I think as a magic item, it would work well. You can limit its existence to only 1-2, keeping it from becoming a problem. As a feat, every spellcaster is going to take that as their first feat. There are just too many good combinations that it would allow.

As a magic item, I could see two different ways to do it (both require attuned): a charged item or a limited scope item. As a charged item, you could require a bonus action to activate it, spending a number of charges equal to the highest level spell being concentrated upon. I would think 6 or 8 charges, recharging 1dx per day, so it won't be massive unless it's used sparingly. As a limited scope item, you could have it work as "you may maintain 1 {spell type} without Concentration." Illusion and Conjuration spells would be good for this, or you could limit it to specific spells if you want.

 

[Krachek]

You can also use : cast at higher level to allow multiple concentration.
Cast one level higher to stack over a single spell.
Cast two levels higher to stack over two spells, and so on.

 

[Yunru]

You can also use : cast at higher level to allow multiple concentration.
Cast one level higher to stack over a single spell.
Cast two levels higher to stack over two spells, and so on.

There's already some (one?) spells that do that. When cast at a higher level they don't require concentration. It costs a hell of a lot morr than 1 level above though.

 

[Krachek]

For example.
You concentrate on flaming sphere.
You want to cast hold person on two targets, and want to stack it over flaming sphere.
You use a level 4 slot.
Adding one more level is maybe not enough. But for playtest it is a good start.

 

[Quartz]

I suggested this in the other thread here. A magic item is better than a feat as a first essay as it can be removed if necessary.

I would limit both spells to be no higher than the caster's Proficiency Bonus. This prevents the Archmage from having her 8th and 9th level slots as Concentration spells. Especially that 9th level Invulnerability spell.

 

[Mort]

Depends entirely on who has it.

On a wizard or any other full caster it'll be devastating.

On say a Paladin or Ranger, it should be okay.

Interesting,

The first abuse I thought of would be a Paladin being able to triple stack smites.

As stated by a few already, I'd be very hesitant to introduce concentration stacking:

1. Concentration is one of the main controls on spellcasters - having seen massive stacking in 3e, the concentration mechanic is a great fix.

2. The game isn't designed to stack concentration meaning that much more likelihood of issues.

That said, testing out an item is a good way to see if concerns are justified.