William searches the room for magic, finding nothing. Nevertheless he and Kilus inspect the items that are present. The lamp itself doesn't seem to be particularly special but the oil burning within it is apparently some sort of strange alchemical creation as it emits shadow rather than light as it burns.

Meanwhile Anthony opens the letter and reads it out:

Spoiler: The letter
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knowledges:

religion
Savin (1d20+2)[17]
Anthony (1d20+9)[14]
Kilus (1d20+1)[13]
William (1d20+12)[19]
DC15: The Lady of Loss and the Dark Goddess are titles of Shar
DC18: The Mysteries could be a reference to Mystra, whose titles include Lady of Mysteries

history or local (Cormyr)
Temiryl (1d20+5)[19]
Anthony (1d20+2)[13]
Kilus (1d20+1)[12]
Anthony (1d20+6)[19]
Kilus (1d20+1)[20]
DC15: The Dusk Lord was the ruler of Sessrendale, which Archendale conquered in 1232 DR.