I am designing some magic items and would like to add some abilities like the following to some of the items:
While holding this item you may cast one of the following spells from it, using your spell save DC and spellcasting ability modifier: x, y, z. When you cast a spell this way, you cannot do so again until the next dawn.
This is pretty standard, usually it works with charges but when it's one spell per day I don't need them.
Now I was wondering about spells that require concentration. Let's say I wanted to add something like Enlarge/Reduce, Bane, Bless, or Bestow Curse. Normally, this would still require concentration but I would like to get rid of that because:
- It would be sad if the user gets hit unkuckily next turn and the item's daily power is wasted.
- I would like the characters to be able to use their own concentration spells unhindered while using the daily power.
Generally, concentration serves two purposes which would potentially be undermined this way:
- Prevent stacking multiple powerful ongoing effects. I think this is unproblematic because the item can be used only once per day. Theoretically, a player could get multiple such items but I think this is handled by attunement and the usual vigilance requires when giving out magic items.
- Offer a possibility to opponents to make the effect end early. I think the necessity of this depends strongly on the spell being used. I don't think the spells I listed above would make this necessary.
I assume there will rarely be a need to end such an effect early but if necessary I would include the option to end any such effect as a bonus action.
Is my analysis reasonable? Are there other problems I failed to account for?