As a DM, I would make the firearm a once in combat thing and reskin a heavy croasbow or eldritch blast as piercing damage and give a knocked prone effect. The RP aspect of a firearm has a lot of potential.
The DM and said player need to talk outside game about possible character concepts.
As a forever DM, I try to work with my players when it comes to the RP aspect of the campaign. It's fun to make side quests or new plot hooks.
Thank you for reviewing each adventure, I'm inspired to order this book.
I have a quick question, in your opinion are there enough navel rules or material to devote 4 to 8 sessions exploring the open sea?
Also, does the book talk about under water combat?