Super Kaio-ken

Super Kaio-ken is a combination of the Super Saiyan transformation and the Kaio-ken technique that is only possible when one is deceased.

Trivia

 * In Dragon Ball Super it is stated that using Kaio-ken alongside Super Saiyan is almost impossible or rather lethal, because the intense emotional turmoil caused by the Super Saiyan transformation would not allow precise ki Control to survive the technique.
 * The Future Warrior's ability to use this technique without dying in Xenoverse 2 is left unexplained, however, it is likely just a developer oversight and has no relevance to the game's plot. Another possibility is that the developers just allowed those skills to be used with Super Saiyan forms for gameplay reasons (as it is possible to use those skills with the Kaioken, Potential Unleashed, or Turn Golden forms).