relics/RelicCreditCard.cs
using Sandbox;
using System.Reflection.PortableExecutable;
using System.Runtime.Versioning;
using System.Threading.Tasks;

public class RelicCreditCard : Relic
{
	public override void LevelUp()
	{
		base.LevelUp();

		Manager.Instance.Stats[StatType.AllItemsCostHP] = 1f;

		// todo: sfx
	}
}