To Serve the Gods: Whitevale
When examined by the party, this pillar in Szartharrax’s den didn’t seem to have any peculiar properties. However, when Szartharrax was defeated, his blood flowed up onto the pillar, which began to glow very brightly until the party passed out.
In the library, it was revealed by the Mysterious Ghost that these pillars emit some kind of arcane barrier that prevents him from continuing his search. The barrier allows physical creatures to approach the pillars but not spiritual entities. It is unknown whether the barrier was designed to keep something out or keep something in. The party seems to have elected to disable all of the pillars.