Mild spoilers inc:
1) Advanced wizard dretch slips through a rift between the Abyss and the mortal world and takes over a deceased wizard's tower, trying to manipulate the dimensional fissure.
2) In a lost desert temple to two rival gods, an evil priest trying to manipulate the heroes to break a seal so that he can plunder the temple unhindered.
3) A village is being attacked by mysterious scorpion-people who turn out to come from a pyramid and desert which both suddenly appeared in the middle of a forest. The heroes must free the captured villagers and venture inside the pyramid to foil the plans of the Scorpion Queen!
4) While travelling, the heroes are caught in a storm and they seek shelter in some caves. There they find some tunnels and tombs of long forgotten rulers of a long forgotten empire. There they encounter some gnoll grave robbers and discover a few ancient secrets before the face off a tiefling mummy!
5) An ancient evil fey creature has been imprisoned in the mortal world. However, his presence has affected the land around him and even the prison where he is held. The heroes are lured into the prison and tricked into breaking the seals that hold him prisoner.
6) The Icon of Corruption has been discovered by some simple peasants and now they worship the ancient evil who crafted it. The heroes must stop the spread of the cult before it gets out of hand and can no longer be stopped.