Story: Oremor was a wild alchemist and wizard. Alone in his tower in the forest, driven by his paranoia and obsession with eternal life, he spent most of his existence experimenting on life, death, and illusionism.
When news of his disappearance spread around, as the dark tower began to crumble, a few adventurers explored its abandoned laboratories, libraries and dungeons, and found many a bizarre item and a few tomes of knowledge: Oremor's diaries on his experiments and discoveries, one of the most useful and less controversial being the Life Veil potion.
Ingredients for one person: a giant bat's brain, a cup of chrysanthemum essence, a spoonful of dried garlic, a coffin's nail.
The brewing: very simple! Mix all the ingredients in a wooden bottle and bury it for one night into a graveyard.
Effects: the imbiber's aura of life will change color, and most undead creatures will not percieve him or her as a living, but as a simple fellow undead creature.
Those with still working eyes (think of ghouls and other corpse eaters) might need some additional cheating (a zombie make-up, for example) but the potion is guaranteed to fool skeletons, wraiths and the like. Unfortunately, no one has yet had a chance to try the potion's effect with a vampire.
As soon as the sun's rays touch the imbiber's skin all effects vanish, and the imbiber is left with a strong headache and nausea. But, after all, the sun never shines into those secret, wight infested, treasure filled sepulchers...
Behind creepy enemy lines!
The PCs have one night to infiltrate the enormous undead army that is approaching the borders of the kingdom, and discover and sabotage all they can!
Adventurers who used the potion during some 'grand theft pyramid' adventure, report of strange nightmares of a lone, gloomy tower in a dark forest, with the feeling of something invisible, lurking in the shadows, creeping, watching, waiting.
Is the ghost of Oremor still inside the tower? Is it really a ghost at all? What other unpredicted effects do his potions actually have? Did he foresee the success of his potion and tried to take some sort of advantage out of it?