Advance
Copper Bottoms
Wood may be the ideal material for shipbuilding, but it tends to deteriorate over time. By fitting our ships with copper sheathing below the waterline we can reduce this deterioration, allowing them to better withstand long journeys.
Advance tree
It has no requires, so the game files don’t say where this goes. When the game builds the 
Reformation tree, it adds this at the end of a branch with room for it, in the same spot in every campaign.
Navy Attrition−25%
Belongs to 1
- ReformationAge