The Castle – a refuge where the King meets with his people, and provides them with help and protection; the Castle appears in various places, wherever people are looking for it

The Enmity – a collective term for the Adversary and his Night Agents

Faithsight – the special vision that comes from looking by faith, instead of looking at tangible appearances 

Heartsickness – a malady brought on by sadness, depression, despair, fear, or guilt; can cause weakness, pain, and other symptoms of both heart and body

Heartwounds – painful injuries of the heart caused by traumatic or unhappy experiences

Kingsmen – followers of the King

Light Agents (or Brightwings) – good agents of the King

Night Agents (or Nightwings) – evil agents of the Adversary

Quellberry – a type of berry that offers pain relief, but also causes drowsiness

The Royalty – a collective term for the King, which includes the Father, Prince, and Royal Spirit

Shadecavern – a cave or catacomb where people may end up if they’re struggling with Mindlurkers or doubts; can be difficult to get out of

Soulblood or Heartblood – dark blue liquid that trickles from the heart under great stress, fear, pain, grief, or guilt

Soulchains – shackles that signify some kind of spiritual bondage; only visible and tangible under certain conditions (even the wearer may not be aware of their presence)

Spellbound – a term used to describe people who are under an enchantment of deception, sin, or the Adversary’s supernatural power