The holovids are full of stories about mecha garrisons bravely battling dastardly pirate raiders. It's a pretty picture for the propaganda films, but its a long way from the truth of the pirate raids.
An explorer gone missing. A king in panic. A treasure to find.
Welcome to the Craggy Peaks. We hope you don't freeze to death.
That would mean we couldn't... play.
A town is besieged by a changing culture and is desperate to hold on to its oldways. But that gets harder as the next generation starts to leave the traditions behind. The drive of some people to resist change and hold on to what they have is so great that they will not only fightthe undead but eventually embrace them.
An elder cleric asks the PCs to transport a relic to a nearby city. A simple quest with endless possibilities.
Some parallel worlds have different time-flows, like the fabled dwelling-places of the elves: those who visit them under the hill for a night return to find that years have passed in this world. Perhaps it is the gate leading between the worlds which causes the alteration. If a gate were 'misaligned', the shift from '| |' to '| \' or '| /' as it were would lead to that difference, much as a light-beam split and bent by a prism ends up taking a longer path. There might even be a mathematical function linking degree of misalignment to alteration of time-rate.