Come! Enter into the safe haven beneath the seas! Where humanity fled from the deadly Kalleum bombs! Take Refuge Beneath the Waves.
You think the zombies are bad? Wait till you meet their masters!
Under the sewers of a large town ancient burial chambers are discovered. If the PCs investigate they fill find that a pale white flowers grows amongst the graves, in the dark.
How do they survive without light? What is their origin? Why in a burial chamber and not just in any old cave?
Can they be sold or do they have any special quality at all? It is up to the PCs to discover.