- "An utterly terrifying, murderous operative, completely dedicated to The Dark Covenant. He has been described as brutal, ruthless, and unhinged. Little is known about his past, probably because he eliminated anyone from it. Known to toy with his victims and bask in their terror. He's a vicious snake, kept in a cage until there's someone that needs to be taken out. And he wouldn't have it any other way."
- — In-game biography
Kryptis, also known as the Dark Rider, is a character featured in Call of Duty: Mobile, introduced in the Season 7: Elite of the Elite Comics and was released as a playable character on October 12, 2021, during Season 8: 2nd Anniversary as part of the Altered DNA Draw. 
Not much is known about Kryptis other than the fact that he is a member of the Dark Covenant alongside Artery, Dark Shepherd, Witch Doctor & Stansfield. He later joins the fight with Templar & Dame in betraying Rorke, killing off his mercenaries with ease.
Later in Blackout, when Templar betrays them after Dame refuses to let his daughter go, he kills Dame & goads the rest of the Covenant into fighting him. Kryptis shoots him, but ends up being impaled by his throwing knives.
When Simon "Ghost" Riley and Templar team up to hunt the remaining members of The Dark Covenant, Kryptis attempts to escape on a motorcycle but crashes when Templar throws a knife into the front wheel. Now cornered with his gun out of reach, he swears that he will not betray the rest of the group, to which Templar says he will.