|N.B. The title of this article is a generalized name for a set of objects that have individual canon names.|
As such, this title is not strictly canonical; however, it has been chosen based on in-comic wording.
In every iteration of Sburb, a construct for triggering the Scratch is provided by the Medium. , a similar construct arises in all sessions as a sort of "panic button", used to hard reset the universe through invoking the Scratch.
If the object is activated by damaging (or "scratching") it in a certain way using an object potent enough to damage it, like the Quills of Echidna, the players' universe and incipisphere will start over from some point before their entry with some changes, providing the players with different initial conditions that ideally lead to a better outcome in the game. Once the object is sufficiently scratched, it begins rising into Skaia; once there, it released a large amount of temporal energy which acts as a "request" to Skaia to change everything at a fundamental level. However, - the defense portals it uses in the Reckoning - and so resulting in Skaia retroactively changing the destination portals of the Paradox Clones. This typically changes which group of Paradox Clones serve as the players in the reset session, and accordingly consigns the pre-Scratch session to oblivion.
The object always appears on the planet of the session's Hero of Time. The Scratch construct looks different in each session and derives its design from its home planet's environment. Whether or not all Scratch constructs relate to a Time player's control object (Dave's Timetables; Aradia's music boxes) is unknown, although it has been the case twice so far.
Shortly after the beginning of his rampage through the B1 session, Jack Noir encountered Dave's Bro at the Beat Mesa and engaged him in a short duel, which was brought to an end when Bro plunged his sword into the Mesa; this caused it to crack and release some of the temporal energy stored within, beginning the Scratch process. Although Bro and Jack quickly absconded afterward, Jack later and in order to finish their duel.
Later, in accordance with Jade Harley and Karkat Vantas's plan, John Egbert travelled to the Beat Mesa to , equipped with the necessary Quills of Echidna. The Scratch was accomplished by fitting the giant Quills into a machine resembling a record player's needle, which then cut a "Z" pattern across the disk of the Beat Mesa; during this process, John defended the Beat Mesa from aggressing Underlings. Once the Scratch was completed, John was collected and taken out of the session by Jade, along with the four planets and the Battlefield, thus ensuring their survival.
It is not currently known if the post-scratch session features a Beat Mesa; it is however unlikely, as the session has no Time player of its own, with that role predestined to be filled by Dave.
The A1 trolls' Scratch construct, the Cardinal Movement, was housed on the Land of Quartz and Melody's pre-scratch counterpart; it looks very similar to Aradia Megido's music box time machines and the structures in the Land of Quartz and Melody.
In their pre-scratch session, it was activated by Damara Megido on the advice of Aranea Serket and Echidna, using what appear to be the Quills of Echidna; the cylinder of the music box has a scratch scored around it helically, indicating that the process of activation is highly analogous to that of the kids' scratch. In order to ensure that the pre-scratch trolls were not completely obliterated by the Scratch, Meenah Peixes killed the team moments before the Scratch took effect and wiped their session.
The post-scratch troll session had , however other similar objects are seen behind it. Whether this was a new Cardinal Movement, or if post-scratch sessions are even able to scratch (as the only other post-scratch session's Hero of Time came from its pre-scratch iteration) is unknown.