| Name | Maddgoth's Helm |
| Type | W |
| Rarity | very rare (requires attunement by a humanoid) |
| Text | A creature attuned to the helm and wearing it has immunity to all damage while inside Maddgoth's castle, on its roof, or in its courtyard. If the helm is taken from the castle, it turns to dust and is destroyed. Source: Waterdeep: Dungeon of the Mad Mage p. 103 |