Place it near the end of an edit, after the boss fight or failed run has finished, so it closes the sequence instead of opening one. Open the fight with the Inception Horn, then let this clip follow the final hit, and keep any later reaction short so the ending stays clear.
About this sound
This 24-second clip is a slow, gentle musical passage from Dark Souls called A Moment's Peace, with soft, unhurried notes that leave plenty of space between them. It feels calm, weary and strangely comforting, like catching your breath after a hard fight. It comes from the Dark Souls games, where quiet music often follows long stretches of tension and danger.