Undead - C

Candles = In the pre-modern days before the invention of electronics, Resurrectionists and other people who hunted spirits used candles as a test for ghostly activity. If a candle couldn't stay lit, there was a Ghost present (and, yes, they would first check for a draft). 
Catacombs = Underground burial places for the dead, often favored by Resurrectionists as places to hide materials or for protected meetings.
Charon = The mysterious boatman who guides souls over the River Styx. For more info see Charon. 
Chess Game With Death = See Chess Game With Death. 
Coffins = Coffins often serve as symbols for Death and Death's inevitability in life. And lots of Goths like to sleep in Coffins too, for what it's worth. For more info see Coffins. 
Corridor = Often described as a 'Corridor of Light,' the Corridor is a passageway that appears to people following their deaths. In mainstream Adept theology, the Corridor leads the soul of the recently deceased onward unto their judgement.