The Workshop is where Golems are made. You can find all 6 types of Golems plus the Artificers that make them. The floor is also lined with generators, which power an electric grid around them and explode when destroyed. Remember that all Golems are healed by ELECTRIC damage.
There is a ring, but no boss in the Workshop. Instead the room containing the ring holds over 20 Golems behind crystal blocks. When you pick up the ring, the crystal is destroyed and the Golems are released. Either plan to fight a conga line of Golems or have a way to escape (TELEPORT, SWAP, BLINK, or Recall potion).