Slindur wrote:A special attribute ability is not a bad idea for the big ships.  They have enough crew and space to be able to do things the smaller ships could not do.  A Harpoon is an interesting idea.  Williamoneeye, what would the attribute point do?  Have some chance of avoiding a lvl decrease from a Call of Leviathan card?
I like the idea of bringing in ship and/or fleet speed into battles.  That would make it more realistic.  Along those lines, could add something like cannon range too.  The capital ships might have a longer range on their guns (higher up above the water, more heavy cannons, etc.) and be able to fire first.
Slindur
I was suggesting that you add extra attribute spaces - 
lvl 1 - harpoonist kills 1 leviathans - per attack  -  time based to match leviathan recast wait time - can only kill 1 per x number of hours
lvl 2 - harpoonist kills 2 leviathans - per attack  -    "                                                                                                                        "
lvl 3 - harpoonist kills 3 leviathans - per attack   -   "                                                                                                                       "
now the cost of this is at a loss of other atts you could select - so you may give up speed to gain a harpoonist and then never get a leviathan used on your Sotl - so it would be wasted -  especially if was a low ATT ship
however if you built a 60 att Sotl and wanted to protect it - It would probably be worth buying a few mastercraftsman and adding a few harpoonists.
EDIT _ after some consideration and discussion, this may work better as increased % chance to stop a leviathan attack. 
Since incoming levi's is not a finite number 
I Really like the Idea of heavier cannons with better range - this may be hard to factor or way off balanced in the current combat system. 
However perhaps it may be an advantage in attacking a port or blockade.   or possibly required for defeating the boss characters in Shadowoods NPC suggestion.