The List

"The List" was Percival de Rolo's original pepperbox pistol, and the first gun he ever created under the influence of Orthax. At some point he had two of the barrels enchanted to shoot magical bullets: one with a fire enchantment and one with ice.

The name of the gun came from the inscriptions on five of the six barrels showing the names of people Percy sought vengeance against. The names on it were:


 * Lord Briarwood
 * Lady Briarwood
 * Doctor Ripley
 * Sir Kerrion Stonefell
 * Professor Anders

The sixth barrel was originally blank, but after Percy returned to Whitestone, the final name appeared: Cassandra de Rolo, Percy's younger sister.

It was eventually discovered that Orthax, the shadow demon Percy had unknowingly made a pact with, was bound to him through The List. This tie was severed when Scanlan took the pepperbox and threw it into a pit of acid.

Trivia
In the same conversation it was revealed that Matt Mercer had decided that, if Percy killed everyone on the list then a new list would appear. Matt and Taliesin came up with this independantly and only found out in the campaign wrap up that they had the same idea.
 * Despite fan speculation that the sixth, blank barrel was for Percy himself, Taliesin Jaffe has stated that no specific name was originally meant for that barrel. Instead, the sixth barrel represented a new start and a new list. If Percy had killed all the people on the list, six more names would have appeared in an endless cycle.