Joint Session of Congress with President Trump

The heroes are fighting for their very skins. Far away, in the Elemental Plane of Earth, there lies the Vault of the Onyx Citadel. This node has influences of the Abyss and the Plane of Magma, and the inhabitants are not only allies of Azearsi, but other forces lurk within the vault too. As we begin, the melee is pitched and the heroes are pushed onto their heels...will they make it out alive, or will they join many hundreds of others who have made the vault their tomb?