This is an official addon for Cold Sweat that allows players to create datapacks that modify the existing origins (from the Forge mod Origins).
These datapacks allow for changing the default values of attributes when the player spawns with the origin, adding attribute modifiers, or making the origin immune to certain TempModifiers (i.e. Merlings are immune to the chilling effects of being wet).
There are some default settings for the Vanilla origins:
Blazeborn
Merling
These settings can be overwritten by user-defined datapacks if needed.
Documentation on the formatting for origins files can be found on Cold Sweat's official documentation page.