Cosmos was discovered when he was only a few months old, abandoned and starving. Tenebrous found him by chance, and quickly brought him into Sanctus Sarcino. Within a few weeks, Cosmos recovered without any signs of longterm damage and began to increase in size. He quickly began to exhibit a steadfast approach to life, and was attached to Tenebrous at the hip. This made him a candidate for the eventual Rank of Heir, and with such was carefully raised and trained by Tenebrous and his Council exclusively. At One Year old, Cosmos was formally adopted by Tenebrous and placed into the Rank of Heir, as well as a seat in Tenebrous' Council. As Tenebrous' First Official Heir, Cosmos was tasked with similar duties to Tenebrous. If Tenebrous were away on duties, Cosmos would then be expected to fulfill the Rank of Acting King.
However in November of 2023; Cosmos withdrew from the Rank of Heir, and chose the Rank of Beta Male, as well as Acting Lead Hunter. With the Acension of Crepusculum, Tenebrous' Mate - the Pack finally had a new generation of King and Queen. Cosmos as Beta Male still serves as Acting King when Tenebrous and Crepusculum are absent. Cosmos now also oversees the Ranks, their workings, and gives his findings to the Council as needed. As to why Cosmos withdrew as Heir, a main reason was that he met the love of his life, Aurora. A second reason was that the Pair had discovered and adopted several "unique" Pups, many of which were also adopted by Tenebrous. A few days later, Cosmos requested that the requirements for the Rank of Heir be overturned, and was given full rights to any changes made. This included the following changes:
•All potential Heirs must now be related to Tenebrous, excluding Pups born prior to this change
•All potential Heirs now must qualify and complete training overseen by Tenebrous' Council or Cosmos
•All potential Heirs now must hold an official Rank prior to advancing to Heir
•Females may now hold the Rank of Heir
•There is now no limit on how many Heirs can hold the title at the same time
The newest Heir in-line is Endymion, a dark midnight colored Pup sired by Tenebrous and Huntress Igneous