Emerald Pen

D&D 2014 item: Emerald Pen. Source: Fizban's Treasury of Dragons. type Wondrous Item, Uncommon rarity This pen is tipped with an emerald nib and requires no ink to write. While holding this pen, you can cast illusory script at will, requiring no material components. Wondrous Item Uncommon

Source: Fizban's Treasury of Dragons, p. 23 - Licenses and attribution