Hey guys, I created this profile (first one I've done here actually) so hopefully, I can give a bit more background on 2786's capabilities, particularly as they relate to this battle. Firstly though, any matchup with 2786 needs to have speed equalized because we don't have a great way of determining his speed given available information.
It's not that 2786 perceives the reality it exists in as fiction, it perceives fiction and conventional reality to be on the same level; as in
both are reality.
On the issue of its scale:
"Hume readings of SCP-2786 reveal little difference from baseline, yet the anomaly behaves and interacts with reality in a way that warps the flow of events to follow what appears to be standard narrative cohesion. It is unknown how SCP-2786 managed to manifest itself within the Foundation, but there has been some hypothesis on the nature of the subject."
The above quote is taken from [
its SCP file]. Hume readings are used as a measurement of the degree to which an SCP warps reality around it. So basically, it doesn't behave as a standard reality warper whose impact can be detected through those means. So, that's inconclusive and likely applies to all of its hax that could broadly be considered reality warping. Next order of business is to try and establish a lower bound which we can do based on the fictional realities in which 2786 has manifested. This includes
Amnesia: The Dark Descent which takes place inside Brennenburg Castle, a large castle which should be at least the size of a town. In the case of
Amnesia, 2786 took control over the mechanics of the game and the laws that govern how it functions. The castle I'm referring to includes orbs capable of transporting people to higher dimensions (edit: it is possible that this is simply another universe not a 5th dimension although it should be noted that the descriptions of its geometry seem to suggest 5D and the Orbs opening the pathway is implied to be an existential threat to the universe) and a potentially Universe level+ entity.
EDIT: will finish this later, have to get off the computer at work