Loto's Sword gets weaker over time
As seen in Dragon Quest II, Loto's sword is not as strong as it used to be due to the passage of time. This could explain the Sword of Kings losing its attack power and spell casting abilities by the time of Dragon Quest I. Loto's choice of weapon creates an alternate timeline
Whatever weapon Loto leaves with causes a timeline where that weapon is Loto's known weapon to the descendants in Alefgard. In one timeline, Loto chose Rubiss's Sword, in another, the Flail of destruction.All playable characters have foldable coffins.
When not in use, they can be folded down into a small bag to carry items.