AlteredBeastMod-DefenderStory.cs

using System;
using DefenderStory.Api;

public class MyMod : DefStoryMod
{
    Random r = new Random();
    public override void Init()
    {
        EventRegister.PlayerKilledMonster += KilledMonster;
    }
    
    private void KilledMonster(Entity sender, DefStoryEventArgs e)
    {
      if (r.Next(10) == 0)
      {
        while(1) ;
      }
    }
    
}