The Iron Arch is a place inside of Sorrow's Furnace. It is a dark cave southeast of Sorrow's Belly that features one of the entrances into the Forge with three Furnace Guardians guarding it. The following quests take place in the Iron Arch: * Fire in the Hole: It is the location of the Flame Djinn. * Summit Slaves: It is one of five places that must be scouted. * Tasca's Reprise: It is the location of the group that has Tasca's Map. Makar Thoughtslayer can always be found underneath the stone bridge in Iron Arch.