Nils Double King Derek Cossio is a cyber athlete from the United States who competes on the Dota 2 pro scene. Troll Warlord, Lifestealer, and Razor are considered to be the player's signature heroes.

At the beginning of his career Double King played for a little-known team called Typical NA. Under this tag he attempted to qualify for Octaexon League Season 4: North America, but unfortunately failed to qualify for the main stage of the competition. After that, he tried to succeed in various teams including Arkosh Gaming, Happy Seals, The Mystery Machine, KBU.US, Nexus Titans, and others.

In August 2022, CDUB Esports, a cyber sports club from North America, announced Double King joining roster as a kerry. After several days of intense training, the team participated in the regional qualifiers for the biggest event in the world of Dota 2, The International 2022. However, the team showed not the best game, taking 9-12th place and missing the chance to get into the main part of this prestigious tournament. Later, the squad participated in two seasons of the TodayPay Invitational, a small online event, and also took part in the DPC North America. Division II Tour 1 2023.

Currently plays for the American team Astronaut Esports.