Sheet of Concentration

Wondrous item, very rare

Sheets of concentration typically come in small collections of 1d4 + 1 sheets. The sheets are blank when found. You can transform a sheet into a special spell scroll by expending a spell slot to cast a spell of 4th level or lower while touching the sheet; the spell must require you to concentrate on it. When you do, the spell has no effect, other than to transform the sheet, which slowly begins to fill with magical runes and writing. After 1 hour or at the end of the spell's duration (whichever comes first), the sheet is successfully transformed into the spell scroll. The sheet is wasted and becomes nonmagical if your concentration is broken before the end of that time or if you cease touching it.

This spell scroll is special: only you can cast the spell on it, and when you do, it doesn't require your concentration. A spell cast in this way ends early if you cast another spell in this way or if it remains in effect for 1 hour. If you're a wizard, you can use this spell scroll without having to read it, provided it's inside your spellbook and the book is on your person.

"...ey! HEY!"
The sound of snapping fingers pulls the wizard from her swirling thoughts.
"Huh? Oh, hey, sorry about that, Cass. What were you saying?"
"Can you put my cat down now? You levitated him up there as a bit almost ten minutes ago and then started concentrating on something else."
The wizard chuckles to herself. "Oh, right. That was a good one."
Cass, obviously annoyed, "...so can you drop him?"
"Just give it a few more seconds and he'll come down on his own. Now let me get back to thinking here."