Wondrous item. Requires attunement.

This polished spiral shell has fluctuating patterns of color that ripple over its surface. If you spend 1 minute looking at the spiral, you gain a supernatural clarity of mind that allows you to make ability checks, saving throws, and attack rolls with advantage for the next hour. You can only gain this effect once per day.

Curse

This item is cursed, and becoming attuned to it extends the curse to you. Until the curse is broken with a remove curse spell or similar magic, you are unwilling to part with it. Whenever you miss a creature with an attack, you must then roll on the Wild Magic Surge table.