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The Skizziks were a human family from Sigil that feared annihilation from their rivals. They made a pact with Asmodeus to become tieflings and they were awarded devil servants who act as their bodyguards and assistants. 
The "Skizziks Khasrym" sent a mercykiller and two chronikers to Camp Vengeance to abduct Strix. The group fought back, and ended up in Sigil for a short time. They destroyed the mercykiller and saw a few tieflings nearby who may have been linked to the Skizziks. The tieflings were arguing about whether or not to intervene: 
- A female, short and old.
- A male, tall and proud.
She furthered learned about the Lorcatha clan, who are linked to angels.
A deal known as the Ashton Concordance kept the two families in a cease fire/non-interference pact. One of the terms of this pact is that members of the two clans can't have anything to do with each other or the multiverse might be destroyed.