Add a new rule to the ruleset as a sub-rule to the rule Island Characteristics, called Natural Monuments:

At any time there are n current monument slots, where n is the number of Islands minus 1, which are tracked in the Great Sea page of the wiki. A monument slot may be occupied by a monument or empty, and defaults to empty.

A monument must have a name, which is always flavour text, a land cost and an effect. All of the monuments that have existed in the game so far are listed (with their variables) at the bottom of the Great Sea page of the wiki.

Islands may contain monuments, and every monument that is owned by an Island must be placed on a level of that Island. A monument may not be placed on a level if placing that monument would result in the monuments of that level having a higher land cost than the amount of land on that level. Monuments held by each Island are tracked by adding their name in square brackets after the land value of that level in the Land column on the Great Sea page of the wiki.

Monuments may have a one-off or repeating effect. If it has a repeating effect then its effect is applied every time the Glisten overground action is taken by an Island. If it has a one-off effect then it is applied when it is taken.

Add a new subrule to that rule, called Generating New Monuments:

Whenever a rule requires monuments to be generated, the following atomic action must be taken:

* Roll DICE5. If the result is a 1 then randomly select an existing monument and include that with no alterations. Skip the rest of this action.
* Roll DICE9. The result is the land cost for that monument.
* Randomly select whether the monument is one-off or repeating.
* Randomly select from the pool of default or orphan dice faces, omitting all “no effect"s and keeping only one copy of any duplicated effects. If that face has a number in it, roll DICE4 and multiply the number in the dice face by the result. That is the effect of the monument.
* Give it a name

In the rule Turns, add the following as the third bullet point in the atomic action for generating time:

* DELAY: Generate a monument for every monument slot

In the same rule, in the atomic action for taking a turn, add the following as a new underground action:

** DELAY: Extrude: Remove a monument from the available monument slots. Add that monument to your Island if you can.

In the same action, add the following as a new overground action:

** DELAY: Glisten: Apply the effects of any monuments on your Island with repeating effects.