Back when someone clamored for the army to wipe out Hamlet, his family was eventually beheaded by the empire's emperor, which allowed Walter to get involved with the empire's army logistics.
That guy isn't important, the reason Lance remembers is because of the wax puppets and the manipulated corpses he had with him at the time.
Before the sacrifice happened, there was a sudden explosion, but the soul fragments were still consumed by the void. Perhaps the sensation of that explosion had startled the legion.
Lance omitted most irrelevant information, directly mentioning the wax puppet he captured before, and the explosion of power when destroying it, concluding it was likely an avatar of a Lich.
As expected, after hearing this, the legion seemed to become agitated, with a simultaneous shout echoing in Lance's mind.
[Kill!]
His strong and formidable spirit was the only reason he wasn't shaken, otherwise an ordinary person might have their soul shattered by the sudden shout.
