Noblesse Oblige: Legacy of the Sorcerer Kings is currently a free game. If you would like to support the game as the passion project of a solo developer, consider purchasing this DLC! The Crown Loyalist Pack is primarily for supporting the game.
Purchasing this DLC does provide minor in-game benefits, including a larger selection of sprites for Alexander, a token worth one point of Noble Support or Popular Support, and a Crown Loyalist necklace equippable by any party member except Alexander. These benefits are a minor token of my thanks, and will never be expected in setting stat cutoffs or when balancing the game!
The DLC content is accessible in game during or after Chapter 5 of the game, when the option to customize Castle Kharos has been unlocked. Once you reach this point in the game, a small golden chest will be available on Alexander's desk as pictured in the screenshot on this page. Interacting with this chest will unlock the DLC rewards.