DamagePlusDaytime.cs

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using System.Collections.Generic;
using System.IO;
using Loot.Api.Core;
using Loot.Modifiers.Base;
using Terraria;
using Terraria.ModLoader.IO;

namespace Loot.Modifiers.WeaponModifiers
{
    public class DamagePlusDaytime : WeaponModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower}% damage during the {(_duringDay ? "day" : "night")}");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMinMagnitude(5f)
                .WithMaxMagnitude(15f)
                .WithRollChance(2f);
        }

        private bool _duringDay;

        public override void Roll(ModifierContext ctx, IEnumerable<Modifier> rolledModifiers)
        {
            base.Roll(ctx, rolledModifiers);
            _duringDay = Main.rand.NextBool();
        }

        // Here we showcase custom MP syncing

        public override void NetReceive(Item item, BinaryReader reader)
        {
            base.NetReceive(item, reader);
            _duringDay = reader.ReadBoolean();
        }

        public override void NetSend(Item item, BinaryWriter writer)
        {
            base.NetSend(item, writer);
            writer.Write(_duringDay);
        }

        // Here we showcase custom loading and saving for a modifier

        public override void Load(Item item, TagCompound tag)
        {
            base.Load(item, tag);
            _duringDay = tag.GetBool("duringDay");
        }

        public override void Save(Item item, TagCompound tag)
        {
            base.Save(item, tag);
            tag.Add("duringDay", _duringDay);
        }

        public override void ModifyWeaponDamage(Item item, Player player, ref float add, ref float mult, ref float flat)
        {
            base.ModifyWeaponDamage(item, player, ref add, ref mult, ref flat);
            if (_duringDay && Main.dayTime || !_duringDay && !Main.dayTime)
            {
                add += Properties.RoundedPower / 100;
            }
        }
    }
}