This is the Moderna Graphical Interface pack (original link) created by Jorge Avila, from opengameart.org. The pack is composed of health and mana bar, vault window, quest window, spells window, quick spellsbar, system icons for “character, vault, spells, configuration and chat”.
If you use this pack, please include the following attribution in a visible location along with any other credits:
"Moderna Graphical Interface" art by Jorge Avila (opengameart.com)
When possible link to blog post that discusses the original art collection. For this asset pack, it would be “Moderna Graphical Interface” art by Jorge Avila (OpenGameArt.org)
About the artist