Awesome! Thanks
@Gazz
So just uncomment it and then duplicate it a few times changing the biome number so it applies to the other biomes and play around with the gamestage base-add value? Definitely going to play around with this. This adds to the player's gamestage so it will affect both enemies and loot, correct? This could give a rough approximation of what is coming without some of the "among other things" you mentioned.
so as a first stab at it like....
<!-- wasteland gamestage bonus-->
<passive_effect name="GameStage" operation="base_add" value="100">
<requirement name="InBiome" biome="8"/>
</passive_effect>
<!-- snow gamestage bonus-->
<passive_effect name="GameStage" operation="base_add" value="80">
<requirement name="InBiome" biome="1"/>
<!-- desert gamestage bonus-->
<passive_effect name="GameStage" operation="base_add" value="60">
<requirement name="InBiome" biome="5"/>
</passive_effect>
<!-- burnt forest gamestage bonus-->
<passive_effect name="GameStage" operation="base_add" value="40">
<requirement name="InBiome" biome="9"/>
</passive_effect>