I.[]
From Lore Master: HEAT
"Some cemeteries of the Solverse are known for their after-hours light shows. Wisps of pinks, blues, yellows and greens are found throughout the cemeteries, making the landscape appear to glow from those headstones. Residents refuse to enter once the lights appear, but those brave enough to watch from close by are rewarded with spectacular auras. Scientists believe the lights are related to radioactive isotopes in the headstones, but you’ll never convince the locals of that."