Add the following to the end of the first paragraph of “Natural Monuments”

Each Monument Slot also has an non-negative integer Bonus, which by default is 0. When a Monument is taken, the Island who took the Monument gains the Monument Slot’s Bonus in Mana, and then that slot’s Bonus is reduced to 0.

In the rule “Turns” replace

Generate a monument for every monument slot

with

Increase the Bonus of every monument slot which has a monument by 10. Generate a new monument for every monument slot which is empty.