Throne of Pagida

While able to create weapons and armor with no equal Thallgrim wished for a creation that didn’t kill and so he created the Throne of Pagída. The Throne of Pagida is one of the greatest creations  Thallgrim has ever done, built to trap an entity as powerful as gods (elder gods temporarily). Once a mortal or diety sits atop the Throne magical chains wrap around the limbs of the person, binding them to the chair and unable to move. The Throne itself has magical properties and those trapped cannot be killed by fatigue or age. To release someone from the chains they must mutter the password, the password only known (currently) by Thallgrim himself.

(Keep in mind Elder Gods will only be affected for an IRL week before they themselves can break the chains) The chains if broken will magically heal itself after time however this process takes decades to do.