public static Buff CreateBuff(Monster monster, Effects effect)
{
    return effect switch
    {
        Effects.Freeze => new Buff
        (
            monster,
            effect,
            lifespan: 3f,
            tickLength: 99f,
            apply: target => target.RecalculateSpeed(),
            expire: target => target.RecalculateSpeed()
        ),
        Effects.Burn => new Buff
        (
            monster,
            effect,
            lifespan: 3.5f,
            tickLength: 1f,
            tick: target => target.TakeDamage(1, DamageTypes.Fire)
        ),
        _ => null
    };
}