Accel Dark Synchro Summon (アクセル・ダーク・シンクロ召喚 Akuseru Dāku Shinkuro Shoukan) is a method of Summoning a Accel Dark Synchro Monster. This variant of Dark Synchro Dummon is used by the Dark Signers in anime.
When performing a Accel Dark Synchro Summon, the required Dark Synchro Material Momstets must be themselves Dark Synchro Monsters. As usual, 1 Dark Tuner Monster and 1 or more non-Tuner monsters are required; this effectively makes the requirement 1 Dark Tuner Dark Synchro Monster and 1 or more non-Tuner Dark Synchro Monster’s. In order for it to count as a Accel Dark Synchro Summon, the Summoned Dark Synchro Monster itself must require a Dark Synchro Darl Tuner and a Dark Synchro Non-Tuner. This is due to the fact that in the anime, Accel Synchro Monsters are a different card type than ordinary Synchro Monsters, as well as Dark Synchros’,
but in the TCG/OCG they are simply Synchro Monsters with Synchro Monsters listed as their Materials.