Alabaster's Shieldbreaker Lance

You conjure a streaking lance of multicolored arcane energy that unerringly strikes a creature you can see within 180 feet. The lance automatically hits it and deals 9d4 damage. If the target is under the effect of the shield spell, the lance detonates upon impact. The shield is immediately dispelled, and all creatures within 10 feet other than the target must succeed on a Constitution saving throw or take half the force damage,