Arien's Gem of Power
Wondrous item, unique (requires attunement by a spellcaster)
The gem embedded in Arien’s throat gives her a +1 bonus to spell attack rolls. She ignores half cover when making a spell attack. She can use an action to speak a command word and regain one expended spell slot. If the expended slot was of 4th level or higher, the new slot is 3rd level. Once you have used the command word power, it can’t be used again until the next dawn.