This video shows where to find another one of the nine Runes needed to unlock the Secret Missions (???) in Minecraft Dungeons. This Rune is located in the Fiery Forge mission area the beginning once you enter the inside area out of the snow. Look down the slope past the fallen Redstone Golem. The switch to open the door to the secret area is in the corner near the lava to the left of the over hang. This is one of the easier Runes to collect since it is so close to the beginning of the mission.
There are 860 views in 17 videos for Minecraft Dungeons. His channel currently has around 1 hour worth of content for Minecraft Dungeons, roughly 3.35% of the content that Sadya Bana has uploaded to YouTube.