Typically, trading for the elite dungeon lore books in story isn't an option. These books are part of the game's internal reward system for exploring and conquering the elite dungeons. They are not made available for trading to maintain the integrity of the gameplay and the value of the in - game accomplishments.
In most cases, it is possible to obtain the elite dungeon lore books in story mode. These books are designed to enhance the lore and backstory of the game. Sometimes, you might find them as drops from bosses in the elite dungeons or hidden in special areas that are accessible during the story progression. It really depends on how the game developers have set up the loot and discovery mechanics.
I'm not sure specifically what 'chalice novel' is about as it could be a very specific or newly created concept. It might be a novel that has a chalice as an important symbol, perhaps related to a mystery, a historical event, or a fantasy story.
One aspect of 'Merlin the Poisoned Chalice' fanfiction could be the exploration of Merlin's character in this particular scenario. It might show his inner strength and loyalty as he faces the danger of the poisoned chalice.
Since I don't know the specific 'chalice novel', I can't tell you the main characters. It could be a hero on a quest for the chalice, a villain trying to steal it, or a group of friends involved in the chalice - related mystery.
I'm not entirely sure without reading it, but usually there would be a protagonist who is likely to be closely associated with the silver chalice. Maybe it's a young adventurer.
The main theme could be about the significance of the silver chalice. Maybe it's a symbol of power, or it has some religious or historical importance in the story.
Bloodborne's story is set in a gothic horror world full of beasts and dark secrets. You play as a hunter trying to uncover the mysteries and survive the nightmarish encounters.