Garreg Mach Monastery is a downloadable stage in Super Smash Bros. Ultimate from the Fire Emblem series. It is based on the pivotal location of the same name and the primary setting of Fire Emblem: Three Houses. It is bundled with Byleth as part of Challenger Pack 5.
The stage cycles through four locations. Transitions between each location have a mystical blue platform rocket the fighters upward, showing a view of the landscape, before plummeting back into the next area (showing damage to areas with ceilings). Like other traveling stages, it is possible to miss the platform as it appears and be KO'd at the bottom blast line. All locations of the stage have walk-off blast lines. The stage rotates through the areas in order and starts over after about two and a half minutes.
The first location is the Marketplace; the battle occurs at the bottom of the stairs. Two stalls are present on the far right and left of the playing area, respectively, which can be used as platforms but can also be destroyed by attacks. The Blue Lion House, represented by Dimitri, Dedue, and Ingrid, will watch the battle from the sidelines; the Gatekeeper can also be seen at his post at the top of the stairs.
The second location is the Reception Hall. The tables in the background can be destroyed if a strong enough attack is landed in front of them, like the signs on Suzaku Castle. Chandeliers hang above the fighting area, so high that certain fighters, including Byleth, cannot reach them on their own. Like the lighting fixture above Boxing Ring, these can be attacked to drop them on fighters below, dealing damage. The Black Eagles House, represented by Edelgard, Dorothea, and Petra, will watch the battle from the sidelines.
The third location is the Bridge. The Bridge is a simple, wide area with walk-off blast lines, comparable to the Bridge of Eldin. The Golden Deer House, represented by Claude, Hilda, and Lorenz, will watch the battle from the sidelines; a Pegasus Knight can also be seen doing flight drills in the background.
The fourth location is the Cathedral. Two semi-solid platforms float above the far left and right of this area; these will slowly move off-screen shortly before the screen transitions. The Church of Seiros, represented by Rhea, Seteth, and Flayn, will watch the battle from the sidelines.