The theme’s extra fields (page options, player and team boxes, post options and more) are made with Secure Custom Fields, a free plugin on WordPress.org. It replaced the bundled ACF Pro in Alchemists 4.10.0.
Secure Custom Fields is a fork of Advanced Custom Fields, with the same functions and the same saved data, so sites that run Advanced Custom Fields or ACF Pro keep working unchanged and aren’t asked to switch.