Ash is a stealth frame. Good for spy missions. My suggestion is to rank him up to max level (30) because that is where all frames reach their peak. To start, ash is mainly known for two of four abities: blade storm and smoke screen. Smoke screen is going invisible and blade storm Is a toggle ability where ash teleports to enemies around you and executes them. To upgrade the duration and damage of blade storm, use duration and strength mods to enhance them. Smoke screen is effective with getting past enemies you don't want to deal with. Use duration mods to extend how long you want to go undetected.