Is there more on Hellkights?

[Nohwear]

Besides the knights book, Inner Sea World Guide, and Paths of Prestige are there many other books, game or novel,m that talk about Hellknights?

[minoritarian]

Book 4 of Council of Thieves, "The Infernal Syndrome" has a section.

[Giuseppe Capriati]

Also, there are some extra details in book 3 of Council of Thieves, "What Lies in Dust". Hopefully Hell's Rebels, and what will come along with it in terms of player companions and campaign settings, will add some extra infos, or maybe some cool player options for hellknights.

[Jeven]

Castles of the Inner Sea describes one of their fortresses.
http://paizo.com/products/btpy8yvg?Pathfinder-Campaign-Setting-Castles-of-t he-Inner-Sea

[Heine Stick]

I seem to recall some Hellknight involvement in the Pathfinder Tales novel Nightglass.

[Hmm]

Emerald Spire takes place near Fort Inevitable, a Hell Knight fort. I bet you would get a lot of flavor on Hell Knights from there.

Hmm