Dark Souls II: Old Iron King by karniz on DeviantArt

Royal Rat Authority - Souls Lore

Tails of Iron Review - Hail to the Rat King! — GAMINGTREND

Ethos of Play

Playing Dark Souls 2: Just googled rat king hoping to find a list of his covenant's rewards so I know whether or not to join - Imgur

Dark Souls 2 Guide: The Doors of Pharros and How to Defeat the Royal Rat Authority

Dark Souls 2 boss Review - The Royal Rat Vanguard

bearer of the curse and rat king (dark souls and 2 more) drawn by setz

Corona Jumper: Dark Souls 2: Scholar of the First Sin - Followup

Dark Souls 2: A review in weapons - Kill Screen - Previously

Tails of Iron is Hollow Knight meets Dark Souls, but for rat lovers