Obatala

Obatalá was a white dragon that Arkhan rode into battle on his assault on Thar Amphala (city). As an NPC Obatalá was played by Matthew Mercer

Background
Obatalá and Arkhan chased Delilah Briarwood and Vecna's Death Knight to Thar Amphala for killing his companion Vander. Here Vecna's followers killed Obatalá and left Arkhan for dead.

During Vox Machina's assault on Thar Amphala Delilah appeared riding atop undead Obatalá. After killing Delilah magic that was keeping the dragon in this state dissapated.