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A skein is a large collection of clans in the Jiralhanae pack system. The clans are united based on their similar cultures, which can differ significantly from other skeins, including their philosophical and religious attitudes. Each skein is led by a Chieftan and his tribe.
- The Vheiloth have sophisticated philosophical views and are devoutly religious. Parabum was a Chieftain in this skein.
- The Rh'tol have little care for metaphysics, though they have sometimes feigned belief in the Covenant religion for the sake of promotion. Tartarus was a member of the Rh'tol skein, and he became the Chieftain of the Jiralhanae during the Human-Covenant war.
A territorial dispute between the Rh'tol and Vheiloth escalated eventually escalated into The First Immolation. Following the war, survivors on both sides would eventually go on to fight the Covenant Empire after first contact. With the integration of the Jiralhanae into the Covenant, the Rh'tol and Vheiloth would fight alongside the Covenant all the way to the Great Schism.
The Vheiloth and Rh'tol remained fierce rivals even into the 26th century, with incidents of violence breaking out among merged packs created by the military with little regard for cultural difference.