Eldritch Absorption

You attempt to absorb the spell of a creature in the process of casting a spell. If the creature is casting a spell of 4th level or lower, its spell is absorbed and you become the new caster of that spell and instantly cast the same spell. You designate any target(s) if any and all effects of the spell remain unchanged. If it is casting a spell of 5th level or higher, make an ability check using your spellcasting ability. The DC equals 10 + the spell’s level. On a success, the creature’s spell is absorbed and you become the new caster and instantly cast that spell. On a fail, the target creature’s spell is not absorbed and they cast the spell as they normally would. The only spell slot used is the one used to cast the spell and becoming the new caster does not take any additional spell slots.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the spell is absorbed and you become the new caster if its level is less than or equal to the level of the spell slot you used.