A little cave-borne adventure about harvesting valuable cysts from a sleeping creature, trying not to be killed by the horribly mutated infectious things that already tried that, and helping a wizard who recently lost all his friends and just wants to get his spellbook back.

How would I use this thing?

1. As a terrible one-shot without consequences!
   
2. Drop "Find the wizard Felix Longworm cowering by stones and a mournful tree" into your mountainous random encounter table of choice, and pull this out when the fates decide.
   
3. If the cave is ignored something else will eventually be birthed out of it, so you get free campaign fodder if your players shake their heads and say "nope".
   
4. Apart from the adventure it also contains a glorious suit of cursed armour, horrific explosives, four new spells, an adorable cut-out map for your players to put together as they explore, and some pretty neat light tracking mechanics, so there's that.

Written with Dungeons & Dragons and its spawn in mind but could be used with pretty much anything without too much fuss.