Heat Dome Attack (ヒートドームアタック) is Future Trunks' final and most powerful attack in his Super Saiyan form. First, Future Trunks throws his opponent up in the air and points both his hands up in the air. Then, he charges a large dome of yellow energy around himself. From this energy dome expels a gigantic Finish Buster up at the opponent, inflicting an enormous amount of damage.
Future Trunks used this attack to destroy Cell in his imperfect form in his alternate timeline. Thanks to his training from the present timeline, Future Trunks easily outclassed Cell and knocked the Android down into the ground. When Cell attempted to attack with his tail, Future Trunks caught it and threw Cell up into the air. Cell then prepared a Kamehameha in hopes of destroying the Earth, but Future Trunks countered and destroyed Cell with the Heat Dome Attack, declaring that the nightmare is over. With the Androids defeated and peace finally restored in his timeline, Future Trunks thanked Goku and the others for everything they had done for him.
Heat Dome Attack was named in the Budokai Tenkaichi series and is Future Trunks' (without sword) Ultimate Blast in his Super Saiyan form. It also appeared in Dragon Ball Z: Burst Limit and Dragon Ball: Raging Blast.