Consider the Abjuration Wizard's 10th level feature:
Improved Abjuration
Beginning at 10th level, when you cast an abjuration spell that requires you to make an ability check as a part of casting that spell (as in Counterspell and Dispel Magic), you add your proficiency bonus to that ability check.
Some spells, such as Telekinesis, include cases where an ability check is not necessarily required, but may be called for depending on circumstances, either as soon as the spell is cast, or later:
If the object is worn or carried by a creature, you must make an ability check with your spellcasting ability contested by that creature's Strength check.
- Does an Abjuration Wizard ever add their proficiency bonus when they cast Telekinesis?
- If so, does that only apply to the case where a check is made on the same turn as the casting, or could it apply later?
Best Answer
No
The other answers have shown that this bonus does not apply to Telekinesis, as it is not an Abjuration spell.
To answer your original question, however: regardless of whether such a spell exists, the bonus granted does by Improved Abjuration does not apply to any check performed after the initial casting of the spell.
The text of the feature is quite clear. Emphasis mine:
The actual casting of the spell occurs only once: directly before the spell is cast. This is supported by the verbiage used to describe spells. Each spell has an associated "casting time", and the spell takes effect immediately after the casting time is complete.
Therefore the bonus granted by Improved Abjuration can be applied only to a check that occurs as part of casting the spell.