Reverse direction and ascend the next set of stairs where you are greeted by a hall that has an Smoldering Butterfly 3 and more explosive barrels for you to avoid. Kill the enemy aheadof you, then smash down the debris behind you to reveal another set of stairs. Kill the enemies at an upper level of staircase, then go down to pick up the Golden Rune [2] on the platform below you.If you want to know more about Elden Ring Runes,you can visit https://www.mmoexp.com/Elden-ring/Runes.html