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Does a spellcaster know when concentration ends on one of their spells?

For example, when a wizard casts invisibility, that target is invisible until they attack or after one hour. So if the character attacks and the spell ends is the wizard aware that their spell that they are concentrating on ended earlier than expected?

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up vote 10 down vote accepted

I can find no RAW , or any rulings at all, that can help answer this question. That being said, the following is speculation based on the entry on PHB pg. 205 that details 'The Weave' of magic.

In conjunction with how Wizards learn their magic, and the knowledge of the Arcane arts and the understanding they must have of the Weave in order to cast such magic; we can assume that yes: A wizard would known when the magic he cast a few turns ago that effected the Weave in such a way as to turn an ally invisible, has lost it's effect and thus become inert. I think this particularly holds true for concentration spells where the Wizard is ACTIVELY maintaining the alteration to the Weave in order to sustain an effect.

When the spell ends, either through the Wizard deciding to end it, the spell running it's full duration, or something ending it prematurely; I have no reason to believe this would be lost on the Wizard in question.

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Yes...

It would make absolutely sense for a caster to be aware when they lose concentration on a spell of theirs.
"This guard hit me pretty hard, I can sense that Invisibility I gave to Tim in order to secretly enter the King's palace wore off! He must be in trouble now!"

However

The situation you describe is not the loss of concentration.

if the character attacks and the spell ends is the wizard aware ...

It's the very subject of the spell breaking it out of their own volition, something completely unrelated to the caster. Concentration is a different mechanism and, in this case, not the only one that can cause a spell to end sooner than its duration.
Ultimately, there are no rules specifying this so it's up to the DM to decide whether all casters in his world have a kind of "arcane sense" that allowed them to know exactly which of their spells are still operational and which aren't. However, do keep in mind that accepting the above ruling can lead to some unexpected and possibly unwelcome situations. For instance, a mage casting a high duration spell, which ends on a trigger like Magic Mouth, in his sanctum/laboratory/tower/house so as to know exactly when someone entered it (triggering its ending).

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I would say that a magical sense, like a 'physical' one, has a limit on its effective range. If the caster is outside of the castle Tim went into I'd let the caster sense the end of the spell, but if they are on opposite ends of the world that makes less sense. For an 'official' ruling at the table I would probably establish a maximum range to the 'magical sense' and measure all future cases by that standard. – Cronax Jan 18 at 9:01

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