ModernUO/Projects/UOContent/Spells/Ninjitsu/FocusAttack.cs

using Server.Items;

namespace Server.Spells.Ninjitsu;

public class FocusAttack : NinjaMove
{
    public override int BaseMana => Core.ML ? 10 : 20;
    public override double RequiredSkill => Core.ML ? 30.0 : 60;

    // You prepare to focus all of your abilities into your next strike.
    public override TextDefinition AbilityMessage { get; } = 1063095;

    public override bool Validate(Mobile from)
    {
        var twoHanded = from.FindItemOnLayer(Layer.TwoHanded);
        if (twoHanded is BaseShield)
        {
            from.SendLocalizedMessage(1063096); // You cannot use this ability while holding a shield.
            return false;
        }

        var meleeWeapon =
            twoHanded is BaseWeapon and not BaseRanged ||
            from.FindItemOnLayer(Layer.OneHanded) is BaseWeapon and not BaseRanged;

        if (meleeWeapon)
        {
            return base.Validate(from);
        }

        from.SendLocalizedMessage(1063097); // You must be wielding a melee weapon without a shield to use this ability.
        return false;
    }

    public override double GetDamageScalar(Mobile attacker, Mobile defender)
    {
        var ninjitsu = attacker.Skills.Ninjitsu.Value;

        return 1.0 + ninjitsu * ninjitsu / 43636;
    }

    public override double GetPropertyBonus(Mobile attacker)
    {
        var ninjitsu = attacker.Skills.Ninjitsu.Value;

        var bonus = ninjitsu * ninjitsu / 43636;

        return 1.0 + (bonus * 3 + 0.01);
    }

    public override bool OnBeforeDamage(Mobile attacker, Mobile defender) =>
        Validate(attacker) && CheckMana(attacker, true);

    public override void OnHit(Mobile attacker, Mobile defender, int damage)
    {
        ClearCurrentMove(attacker);

        attacker.SendLocalizedMessage(1063098); // You focus all of your abilities and strike with deadly force!
        attacker.PlaySound(0x510);

        CheckGain(attacker);
    }
}