Short Answer 
To achieve the “King of Kings” in WorldBox, start by playing in Sandbox Mode, ensuring you create a supportive environment for your king from any humanoid race. Focus on promoting prosperity and stability while avoiding harm to the king, aiming to maintain his reign for 500 years to unlock the achievement.
Step 1: Set the Scene in Sandbox Mode
To start your journey towards the King of Kings achievement in WorldBox, ensure you are playing in Sandbox Mode. This mode allows you complete freedom as a deity, without the constraints of Civilizations or World laws. You will need to create an environment suitable for your king to thrive and reign for an extended period.
Step 2: Choose and Support Your King
Select a king from any humanoid race and take measures to encourage his longevity. It’s crucial to create conditions that promote a peaceful and stable reign. To do this, focus on the following:
- Do not engage in any actions that may harm the king.
- Promote prosperity within his kingdom.
- Ensure that the king is satisfied and continues to worship you.
Step 3: Maintain the King’s Reign for 500 Years
Your ultimate objective is to sustain the king’s rule for a full 500 years. Throughout this period, closely monitor his wellbeing and the stability of his kingdom. Should you succeed and the king reaches the 500-year mark, you will successfully unlock the King of Kings achievement!