D&D 5e (2024)

Source: Arcana Unleashed

Wondrous Item, Uncommon (Requires Attunement)

This glass orb is a useful defense against meddlesome mages and magic-wielding spies.

Detect Divination. When you are targeted by a spell from the Divination school, the orb glows bright green for the spell’s duration.

Spellcasting Focus. This orb can be used as an Arcane Focus.