LiskovFixedExample.cs

using System;

public abstract class Character
{
    public int Armor { get; set; }
    public int Life { get; set; }

    public abstract void Attack();
    
    public abstract void TakeDamage(int damage);
}

public class Warrior : Character
{
    public int Armor { get; set; }
    public int Life { get; set; }

    public override void Attack()
    {
        // Attack to closest enemy
    }
    
    public override void TakeDamage(int damage)
    {
        Life -= Math.Max(0, damage - Armor);
    }
}

public class Mage : Character
{
    public int MagicProtection { get; set; }
    
    public override void Attack()
    {
       // Throw a Fire to target
    }

    public void Hex()
    {
        // Convert target to sheep
    }
    
    public override void TakeDamage(int damage)
    {
        Life -= Math.Max(0, damage - Armor - MagicProtection);
    }
}