Svetlana's Stall!

Svetlana's Stall is a shop in secret areas of certain SAIL missions, such as Verdant Ruins, Tower Invincible, Brine Star, Hydro Center, Sky Boulevard, Mount Gigant, Letheia Facility.

These areas are usually very difficult to reach (for example, it may be necessary to activate numerous levers that are hidden all over the mission).