The Forge is a place where the dwarven smiths create the most powerful Asgardian weapons, equipment and artifacts in all the Nine Realms. It is located in Nidavellirr, the realm of the dwarves led by Etrie.
The Fall of Asgard
A Day Unlike Any Other
Tony Stark and Etrie had went to The Forge to build the Thorbuster armor made of uru and based on the Destroyer in preparation for the final battle with the Avengers against Loki in Asgard.