Grimlore's Grimoire

Spellsteal

4-level Abjuration

You cause a creature you can see within range to make a Wisdom saving throw. On a failed save, you place a minor hex on them. The next spell they attempt to cast of 3rd level or lower fails and has no effect. When they fail to cast a spell in this manner, you are able to immediately cast it using your reaction instead. Casting a spell in this manner grants you temporary insight into how the spell is cast even if it is not on your available spell list and does not use a spell slot. The spell is not added to your spellbook.
At higher levels: If you cast this spell using a spell slot of 5th level or higher, the spell level that you can affect increases by one level for each spell level above 4th.