The Old Man Winter Plasmid used in the "Burial At Sea" DLC was created by Joe Trinder. He posted the design on the game's official forums. Trinder's design was immediately praised by other fans, quickly gaining attention on Reddit and even earning the approval of BioShock creator Ken Levine. Within a day, Irrational contacted Trinder and asked for permission to publish the poster on their Facebook page. A month later, the team bought the design from Trinder, and told him they planned to use it in the game. His initial version was for a Vigor, but it was changed into a plasmid to fit with the game's DLC.