Thank you, sushiundmulch! I felt a simple approach for the ice ships was needed and afterwards realized that I had arrived at a creature-based rule. :D
I'm glad you liked the lake wyrm! If there had been room for another paragraph, I might have had there be a zombie fish inside the stash of pickled fish the characters receive as part of their reward, requiring a Toughness role to avoid infection. But I was out of space and I figured if the characters survived the surprise encounter with the wyrm, they deserved a successful conclusion to the adventure.
After the jam concludes I will consider producing a longer "director's cut" version with a map of the towns and trading posts, shorelines and frozen marshy islands, plus some encounter tables to roll against and additional NPCs. :D
Thanks again! :D
Dennis