Obatala

Obatalá was a white dragon who Arkhan rode into battle in his assault on Thar Amphala. As an NPC Obatalá was played by Matthew Mercer.

Background
Arkhan helped raise Obatalá.

Members of Vecna's cult, led by Delilah Briarwood and a death knight, ambushed Arkhan and his companions weeks before Vox Machina's final assault on Vecna's stronghold; they killed his companions, including Vander, and left Arkhan for dead.

During Vox Machina's assault on Thar Amphala, Delilah and Sylas Briarwood appeared riding atop an undead Obatalá. After killing Delilah, the magic that was keeping the dragon in this state dissipated, and the dragon collapsed.