Glomdroing:

Turn all unmelded forest/swamps to Wyrden.

Serenwilde:

Turn all unmelded forest/plains to forest

Celest:

Turn all unmelded water/plains to pure and or flooded;

Magnagora:

Turn all unmelded water/swamp to Tainted; or maybe something else.. like wastelands.. not sure exactly how to get a good terrain balance that makes RP sense.

But you get the basic idea.

Added to the list on the 1st post!