This group of arrancar's purpose is to deal with any intruders and rebels within Las Noches, more often than not they usually deal with both giving them their name.
It is unknown exactly how much power the Espada, and even the Números, have over this group, but both has shown to have some degree as such. The Octava Espada Szayel Aporro Granz ordered the Exequias to kill the intruders of Las Noches (Ichigo Kurosaki, Yasutora Sado and Uryū Ishida) and gather the corpses of the deceased Privaron Espada. After they have been gathered by Szayel, they then continue under the command of Rudobōn.
During Rudobōn's battle with Rukia, he reveals the Exequias came about because of the special ability of his Zanpakutō - Arbol. It's ability allows him, when in his Resurrección, to create an infinite amount of completely loyal 'underlings' called Calaveras, thus explaining why they all have the exact same mask and Katana. Critically thinking about the Exequias would cause one to come to the conclusion that the sole member of the Exequias is Rudobōn with the others being creations from his very own being. These creations have shown no variation in personality or any form of individuality.
 Known members of Exequias
- Rudobōn: Sole, and technically only, member of the Exequias.
- Calaveras: Produce the entirety of the group, they are created by Rudobōn.
The uniform for the Exequias comprises of a white hakama and jacket as worn by all Arrancar under the control of Sōsuke Aizen. All Calaveras have the same mask and as such the same Zanpakutō, although whether these katanas have any power is unknown. The only thing that separates Rudobōn from the other members of the Exequias is his mask compared to the more humanoid ones the members wear.