Like all outsiders, kytons do not feed on the same food as humans. That does not mean they do not need to consume something to sustain their existence. For devils, it is despair. Any type of despair will do but they particularly love the aroma of despair from oppression. If a soul they take for their own gives up and accepts that there is no escape from Hell, they feed upon that despair. That is their food. Which is why devils work so hard to make someone give up and accept the terrible situation around them instead of fighting to change it. For azatas, it is joy. They feast upon the child-like joy and wonder of a soul experiencing a place for the first time. This is why the chaotic good plane constantly sprouts new flowers and features an ever-changing landscape, perfect for adventure.
Kytons feed upon willful surrender. They love someone that willingly accepts pain. These outsiders will never remove the ability for a soul to not accept the pain they offer because a forced surrender taints the taste of that surrender to them, making it unpalatable to them. So the pain they offer is pleasurable to those that give of themselves willingly. This differs from devils in that a devil always aims to outmaneuver their target, so they have no choice but to give in to a devil; such actions are an anathema to a kyton. The chainclad want that sweet taste of willingness.
Below are some of the images of kytons of Shadowsfall. Some of these will be in the upcoming campaign for Shadowsfall while others will be in a a future Shadowsfall monster book.
Below is a whelp kyton, one of the lowest form of kytons in existence. Its eyes are not under a blindfold as many believe. It keeps what humans would consider eyes closed until it uses its unnerving gaze where the target sees itself in a similar position of voluntary servitude as the whelp. The chain it wears around its neck attacks anyone that attack it. Additionally, the chain lifts it off the ground by the neck when it needs to fly. It carries out small jobs that are beneath the status of more powerful kytons. For all this, it gets to feed upon the willing submission from those that kneel to its master.
Kyton, Whelp CR/HD 2
Init +1; Perception +7 (darkvision 60 ft.)
Size Tiny; Speed 15 ft., fly 30 ft.
AC 14 (touch 12, flat-footed 12); Fort +1, Ref +1, Will +5; CMD 12; Concentration +5
hp 20; DR 5/good or silver; Immune cold, fear effects
Melee chain +3 (1d8+3), 2 claws –2(1d6+1)
Attack Spells (DC 13 + spell level) 1/day—inflict light wounds, scare
Attack Options unnerving gaze (30 ft., DC 13, shaken for 1 round); CMB –1
Utility Options alertness, telepathy 60 ft.
Dex +1, Int +2, Cha +3; Bluff +10, Escape Artist +7, Fly +7, Perception +7, Perform (act) +10, Sense Motive +10, Stealth +10,
XP 600; LE Outsider (kyton)