The old crone can be found in the house east of the slayer tower.
She has a central role in Ghosts Ahoy, and a minor role in Animal Magnetism.
She was once a resident of Port Phasmatys and was a friend of Velorina. She spoke out against Necrovarus and fled before he took power.
During both quests, she will modify a player's ghostspeak amulet in ways that are required to complete the quests successfully.
Old crone is the solution to the elite anagram clue: COOL NERD. The answer to her question is 619.