The Umbrastaff is a magical artifact.
Description[]
As Gladstone Gander read in 2017, the glossary of the Ars Goetia Revised Edition's entry on Magic Wands invites one to cross-reference it with other entries in the book: "Staff", "Sonic Screwdriver" and "Umbrastaff".
Behind the scenes[]
The Umbrastaff (more properly spelled "Umbra Staff") is an artifact from The Adventure Zone, a series of which Sarah Jolley is notoriously fond; its inclusion in the 2017 (unlicensed) comic A Kind of Magic is a fun nod to that series, much as the mention of Sonic Screwdrivers is a nod to a nod to Doctor Who.
Within The Adventure Zone, the Umbrastaff is an umbrella-shaped magic wand; it is uniquely powerful among all magical items in the setting for its ability to absorb and merge with other magical objects and spells.