Draneria, a Krita user and creator, has shared a set of free metallic brushes for use in Krita. The "Metallics by Draneria" collection includes 32 brushes, 13 textures, 3 patterns, and 1 palette, as well as a PDF guide and 23 brush tips. The resources are licensed under CC-BY-SA and can be downloaded from Ko-Fi or GitHub.

Source: https://dev.to/draneria/metallics-by-draneria-free-brushes-for-krita-3k5o