Chain Lightning Size:2XL It takes 7d8 + 30

It takes 7d8 + 30 necrotic damage on a failed save

returning to its home plane

The spell leaves an invisible mark on its surface and invisibly inscribes the name of the item on the sapphire you use as the material component

which are lost when the spell ends

Chain Lightning Size:2XL It takes 7d8 + 30You create a bolt of lightning that arcs toward a target of your choice that you can see within range. Three bolts then leap from that target to as many as three other targets, each of which must be within 30 feet of the first target. A target can be a creature or an object and can be targeted by only one of the bolts. A target must make a Dexterity saving throw. The target takes 10d8 lightning damage on a failed save, or half as much damage on a