Laduguer

Aduger is the god of strength, conquest, and power in duergar mythology.

Vox Machina discovers and effigy of Aduger while exploring the Emberhold. Tiberius memorizes his features meticulously, and later transforms into then likeness of the God to intimidate the duergar militia in the Emberhold's throne room. Keyleth assumes the form of a giant scorpion and pike applies a spell (Thaumaturgy) to amplify Tiberius' voice in order to provide a distraction while the rest of Vox Machina attack with the element of surprise.