The Quills

"A secretive order, loyal to the mysterious and reclusive 'Unum'. Some say their relationship to cause and effect is unnatural, their knowledge profane. When a Quill acts, things change."

The Quills are a mysterious monastic order that serve the equally enigmatic Unum, a being who resides within the Orokin Tower at Cetus in the Plains of Eidolon. They have very close ties to the Ostron people who also praise the Unum, and are seemingly knowledgeable about the secrets of the Tenno. They are said to be able to divine the future, which combined with their information gathering prowess allows them to preemptively end threats to Cetus through the Tenno. The player will be able to ally with the Quills after completing both Saya's Vigil and The War Within quests and bringing their Operator to a cave in the north-east part of Cetus.

As a Syndicate, the Quills have their own Standing that can be exchanged for various rewards. Quill Standing can be earned solely by selling Sentient Cores to them, which can be obtained from Sentient enemies out on the Plains. The Quills are a neutral Syndicate, and gaining Standing with them will not affect a player's Standing with any other Syndicate.

Standing gain
To earn standing for the Quills, players must find and collect Sentient Cores dropped by Eidolon Vomvalysts, Eidolon Teralysts, or Lua's Battalysts and Conculysts (along with their decaying variants), which can then be traded in for standing. Fully-constructed Amps can also be traded in to the Quills for standing, whether or not they have been gilded.