He sees you when you're sleeping; he knows when you're awake ...
He knows if you've been bad or good.
Can the Dragonslayer be used in group combat involving the Dragon, if the wielder is not adjacent to the Dragon?
For example, if Blue Dragon, Yellow Thief, Blue Cleric, and Yellow Warrior are lined up in a row, and Yellow Warrior is carrying the Dragonslayer, then does the bonus apply when he attacks Blue Cleric?
To be effective, the Dragon Slayer must be adjacent to the Dragon.