ForgottenWawiTech/Content/Items/Prefixes/Healthy.cs

using Terraria;
using Terraria.ModLoader;
using System.Collections.Generic;

namespace ForgottenWawiTech.Content.Items.Prefixes
{
    public class Healthy : ModPrefix
    {
        public override PrefixCategory Category => PrefixCategory.Accessory;

        public override void SetStats(ref float damageMult, ref float knockbackMult, ref float useTimeMult,
            ref float scaleMult, ref float shootSpeedMult, ref float manaMult, ref int critBonus)
        {
        }

        public override void Apply(Item item)
        {
            item.GetGlobalItem<HealthyPrefixGlobalItem>().hasHealthyPrefix = true;
        }

        public override void ModifyValue(ref float valueMult)
        {
            valueMult = 1.5f;
        }

        public override IEnumerable<TooltipLine> GetTooltipLines(Item item) 
        {
            yield return new TooltipLine(Mod, "HealthyPrefix", "+20 Max HP")
            {
                IsModifier = true,
                IsModifierBad = false
            };
            yield return new TooltipLine(Mod, "HealthyPrefixRegen", "+3 HP/s")
            {
                IsModifier = true,
                IsModifierBad = false
            };
        }
    }

    public class HealthyPrefixGlobalItem : GlobalItem
    {
        public bool hasHealthyPrefix = false;

        public override bool InstancePerEntity => true;

        public override void UpdateAccessory(Item item, Player player, bool hideVisual)
        {
            if (hasHealthyPrefix)
            {
                player.lifeRegen += 3;
                player.statLifeMax2 += 20;
            }
        }
    }
}