Wall of Moonlight is a level 4 spell from the Priest Scroll in Icewind Dale, which is added with Heart of Winter.
Description[]
| “ | This spell invokes a shimmering tapestry of blue-white force. This wall is intangible, requiring no physical anchor, and can easily be passed through. Evil creatures passing through the wall take 2d10 magic damage; evil undead creatures take 5d10. A creature that has passed through the wall can only take damage from it once. | ” |