Anulus Vaticinii

The Anulus Vaticinii is also known as the Ring of Omens.

Description
A mithril ring shaped like an opened flower, its five petals made of shimmering diamonds, and engraved with Old Elvish runes.

Qualities
While wearing this ring, you are immune to magic that allows other creatures to read your thoughts, determine your location, determine whether you are lying, know your alignment, or know your creature type. Creatures can telepathically communicate with you only if you allow it.

While wearing this ring, you can use your reaction to absorb a spell that is targeting only you and not with an area of effect. The absorbed spell's effect is canceled, and the spell's energy—not the spell itself—is stored in the ring. The energy has the same level as the spell when it was cast. The ring can absorb and store up to 50 levels of energy over the course of its existence. Once the ring absorbs 50 levels of energy, it can't absorb more. If you are targeted by a spell that the ring can't store, the ring has no effect on that spell.

When you become attuned to the ring, you know how many levels of energy the ring has absorbed over the course of its existence, and how many levels of spell energy it currently has stored. If you are a spellcaster holding the ring, you can convert energy stored in it into spell slots to cast spells you have prepared or know. You can create spell slots only of a level equal to or lower than your own spell slots, up to a maximum of 5th level. You use the stored levels in place of your slots, but otherwise cast the spell as normal. For example, you can use 3 levels stored in the ring as a 3rd level spell slot.

You can use an action to cause the ring to become invisible until you use another action to make it visible, until you remove the ring, or until you die.

Lore
The Anulus Vaticinii was created by the Elvish Emperor's artisans for his beloved daughter Elena as a wedding gift. When she, instead of marrying the prince her father had arranged her to marry, took the ring to the Nuns of St. Attela, the nuns kept the Ring as a relic of their most pious sister.