Sekiro: Collapsible Bow and War Fan by Bruno Marquez, page 23

Collapsible Bow and War Fan by Bruno Marquez (Artstation, Twitter) is featured in Soul Arts on page 23.

Collapsible Bow and War Fan by Bruno Marquez p. 23

The artwork shows a symbol that is referenced in the Sekiro pattern on the endpapers.

Collapsible Bow and War Fan by Bruno Marquez p. 23