The wand was challenging to design to avoid it from looking too much like a prop out of Harry Potter. The idea was to make it look like it was made from a bone from an ancient powerful wizard (or Bright). A functional catholic relic. To borrow from the film’s dialogue, the wand is a nuclear weapon that grants wishes.
Flintlock pistols were an inspiration for some ideas.
The final design, by another artist is a sharpened version. The wands tends to be glowing and hard to distinguish in most of the movie, with one exception, when the Inferni chase the heroes through the Abrams neighborhood. I had a lot of fun sculpting the filigree in Zbrush.