"What is going on?" was a question everyone on the side of the players from the northern kingdom.
Only Dave had the answer to that question. The demons, part of his deal with Asmodeus that they were to help aid the world when the Calamities were out, and it was time for them to answer to the contract.
The demons came down in droves, massive in numbers and with a searing infernal heat that accompanied them from the depths of hell to the overworld. The creatures came out and charged up the calamities.
Players and Undead on one side, and demons from the other. A massive crash happened where the Calamities were stuck between two armies and were being grounded to death.