Would that seriously affect the point cost?
Without seeing the other ship/abilities I have no idea.
For the Serenata, I was saying that the ability should only affect stuff within S. The speed of the ship is fine, it’s the ability that makes the original OP. If you leave everything else the same and do “One friendly ship within S of this ship gets +S to her base move”, I think 15 is OK for a first playtest.
One thing to keep in mind with speed is that it can compound on things that are already really good. With Griffin/captain/helmsman and a ship like this, you could pretty easily have the Shui Xian consistently going L+S+S+S per turn, let alone with SAC to double that. Sure it costs a lot, but at some point there should be some kind of cap on how fast these really dangerous vessels can even go, at least in my opinion. I’ve actually made at least one OP custom with a speed boost that might just get completely nixed for a different ability. Since speed is the most important ship attribute in this game, it almost cannot be overvalued, and things like the classic helmsman and navigator crew can make powerful customs feel undervalued.
Faction Affiliation: Jade Rebellion
Point Value: 8
Ability: Helmsman. EA. [Extra Action: Once per turn, roll a d6. On a 5-6, this ship may be given an extra action.] Place this crew face up during setup. Reduce the cost of all other crew placed on this ship by 1.
Link: All French ships
Flavor text: Although he grew up in France, this legendary man was erroneously labeled a traitor for a bizarre set of circumstances involving the Cursed. Since becoming one of the leaders in the Jade Rebellion, his expertise has only grown. He occasionally uses some of his vast cache of diamonds to hire the best crew in the world to help him achieve god-like status.
Historical Custom of the Day #353
Eric Cobham and Maria Lindsey
Ability: Massacre. [If this ship succeeds at a boarding party, she can eliminate all of the other ship’s crew.]
You can find my custom sets here: Pirates of the Age of Sail and Pirates of the Epic Seas