Elevator Upwarps
Elevator Upwarps are a specific subset of positional glitches where the player exploits the vertical movement of an elevator to force the game to teleport them to a higher level.
In Dark Souls Remastered, elevators are moving platforms with complex collision data. By standing on the edge of an elevator, or by falling into the default position of an elevator followed by a quit-out, the player can "warp" to the ending point of the elevator.
Resources
New Londo upwarp : https://youtu.be/RF-5KdzMo6I?t=339 by tamatama on YouTube.
Duke Archives upwarp: https://youtu.be/Ylu3_O3pto4?t=2888 by catalystz on YouTube.