Brainstorm with me this.
A meteor shower that is currently orbiting the world will sometimes (once or twice per year) will drop some rocks on the surface containing random ore. Some say Armok is flossing his teeth and bits are falling onto the world, but one can only rejoice in his eternal blessings...
Sometimes, ships with aliens crash on the surface and proceed to invade nearby civilizations. They carry very powerful weapons and armor, and their ship contains dangerous defenses for the foolish dwarves that want to explore the wreckage, should they overcome the conquerors from beyond the stars.
Seriously:
One or two times per year, random parts of the surface get meteors spawned which are irregular sphere of dirt and random veins of ore.
Every now and then instead of a meteor, an alien ship is spawned with these monstrous creatures. They are any of various alien races with weapons and armor from their civilization and inside the main chamber, some forgotten beasts that are captains, or captured monsters or who knows what, but still in the spirit. When dead, the dwarfs get access to high end materials and access to the armory >
Ideas:
- the aliens are tentacle-ish, inseminating eggs into dwarves or dwarf corpses to spawn more of their kin (without gear ofc).
- the aliens create a base on their crashed ship and multiply.
- the aliens divide and when their size is large enough, they do a mass invasion.
Whatcha think?