Well I know how to increase the spawn probability in the entitygroups.xml but I think the problem im having is I install the mod when my playthrough is still at a relatively low game stage therefore the zombies don't spawn as much. But if you can show me some instructions I would like to see them
All of these are GS dependent for regular zombies but the custom entries are not GS dependent and will appear at the same probability; albeit less frequently.
<append xpath="/entitygroups/entitygroup[@name='ZombiesNight']">
<append xpath="/entitygroups/entitygroup[@name='ZombiesAll']">
<append xpath="/entitygroups/entitygroup[@name='ZombiesBurntForest']">
<append xpath="/entitygroups/entitygroup[@name='SnowZombies']">
All of these are custom entries that are not GS dependent. If you visit these Biomes based on their description you are much more certain to see the custom zombies even at low GS.
<entitygroup name="ZombiesWastelandNightHard">
<entitygroup name="ZombiesPineForest">
<entitygroup name="ZombiesPineForestNight">
<entitygroup name="ZombiesDesertNight">
In addition, the smaller your World and the higher you set your total allowed zombies, the greater the density.
You can also change the settings in the spawning.xml for those custom groups. Increasing these means you will definitely see them and quite possibly a little too much.
<configs>
<append xpath="/spawning/biome[@name='pine_forest']">
<spawn maxcount="1" respawndelay="1" time="Day" entitygroup="ZombiesPineForest" />
<spawn maxcount="1" respawndelay="1" time="Night" entitygroup="ZombiesPineForestNight" />
</append>
<append xpath="/spawning/biome[@name='desert']">
<spawn maxcount="1" respawndelay="1" time="Night" entitygroup="ZombiesDesertNight" />
</append>
<append xpath="/spawning/biome[@name='wasteland']">
<spawn maxcount="1" respawndelay="1" time="Night" entitygroup="ZombiesWastelandNightHard" />
</append>
</configs>
Changing the maxcount to 2 will be quite noticeable.