Spawn Conditions are a way for you to override the vanilla conditions system, and configure conditions of your own.
To add a mob to override, simply create a list for a mob under the
spawn-conditionsoption in the entities section of the config.yml. You can find a list of entities that correspond to the version of your server by clicking here.
# Setting an empty list to a mob will remove all spawn conditions
# This example will remove all other spawn conditions and only have NOT_PEACEFUL as a spawn condition for Zombie.
This is a list of spawn-conditions available by default.