You push your nerd glasses back up onto the bridge of your nose as you attempt to interrupt a creature in the process of casting a spell. As part of the casting of this spell, make an Arcana (Intelligence) check. The DC for this check is equal to 8 + one third (rounded up) of the spell's base level (the lowest level it can be cast at, cantrips count as level one for the purposes of this check) for spells you know; 8 + one half (rounded up) of the spell's base level for spells on your class's (The class you learned this spell through) spell list; or 8 + the spell's base level for all other spells. On a failed check, you are unable to identify the spell being cast, and this spell is wasted.
If the creature is casting a spell of 3rd level or lower, its spell is changed to the one you have changed it to, though it does not change the target chosen by the caster. The spell can be corrected to any other spell (regardless of class restrictions) at an equal level, so long as the first letter of the new spell is the same as the intended spell. The new spell ignores range restrictions to take effect on the original target point/creature(s). The new spell "grows" to fill the spell slot used for the original spell, if necessary. If it is Casting a Spell of 4th 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 changed.
At Higher Levels. When you cast this spell using a spell slot of 4th Level or higher, the affected spell is corrected if its level is less than or equal to the level of the spell slot you used.
* - which you take when you see a creature within 60 feet of you casting a spell
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