Idea for a random event: A large comet falls from the sky and destroys one of your cities. In the wreckage you find a magical ore not before found in this realm. You craft the ore into a weapon of your choosing. It is basically all powerful, a decent exchange for the city that was destroyed. 

Cool idea!

yes i like the idea.. instead of just plus and negative events, a bit of both events also.. spells and such do this.. i know other games have this like Crusader Kings, so why not in FE?

I actually have made a modification for Warband where I've added random events. The type of situations I add are ones that come with good and bad consequences depending on what the player chooses. Normally a person goes about what is the right choice. But if someone can make a choice and deal with what consequences they come with regardless if it is bad intentions for a good outcome and vice versa. These random events help to mix up gameplay and challenge the player without hurting his gameplay experience and furthering immersion.

Those types of events are much better than your usual disaster scenario from Sim City or GalCiv2; and more like deciding if that mega prison or epic mall will be a good benefit or eventually bad thing to build in your "Sim" city.