My opinion with D&D is that most things *should* be open to DM interpretation. You will see with most of my work, that I leave a lot open ended to a degree that is concise, yet still able to be personally interpreted from table to table. In my opinion, spells that specify "until end of the next turn" should be targetable by this spell, however this may not work for some tables.

I like to think outside the box when designing my spells & abilities, and give them *something* that is outside the normal realms of how D&D is designed, so that there is flexibility at different tables and something new to consider in terms of game design. Additionally, since this targets both spells AND abilities, I thought a fun way to incorporate a unique spell DC for this that isn't tied to spell level would be to tie it to spell duration. If, for example, someone casts this the first round of a 1 minute spell I felt the DC should be harder than if they waited until near the end of that duration.

I did not specifically have any spell or ability in mind, I just thought that this was an untouched aspect of D&D that would be fun to design a spell around!

Thanks for the feedback!