Dragon Krystals can be used to purchase customization for your characters, similar to Invasions Currency.
Skins, Colors, Gear, and possibly taunts and brutalities.

Ignore the Xbox one listing that just means u can buy them from Xbox one.#MK1 #MortalKombat1 pic.twitter.com/i6Ou8RYNxG

— thethiny 🐰 (@thethiny) September 3, 2023