Infernion

The red dragon bows low to the image of Metherna for a moment, until he sees its is merely a pre-recorded scroll.

After the drow is done speaking in Infernion says "Very well, I assume you know I am Inferion, the Red. You can serve us best by walking through that door with us and killing everything on the other side." At the same time, Infernion walks to the passage the newcomers just came down and places himself in the doorway.