status/CurseHealthPackStatus.cs
using System;
using System.Collections.Generic;
using System.Linq;
using Sandbox;

[Status( 3, 0, 1f, 0, true )]
public class CurseHealthPackStatus : Status
{
	public CurseHealthPackStatus()
	{
		Title = "Poison Packs";
		IconPath = "textures/icons/curse_health_pack.png";
	}

	public override void Init( Player player )
	{
		base.Init( player );
	}

	public override void Refresh()
	{
		Description = GetDescription( Level );

		Player.Modify( this, PlayerStat.HealthPackAmount, -GetAmountForLevel( Level ), ModifierType.Add );
	}

	public override string GetDescription( int newLevel )
	{
		return string.Format( "Health packs heal {0} less HP", GetAmountForLevel( Level ) );
	}

	public override string GetUpgradeDescription( int newLevel )
	{
		return newLevel > 1 ? string.Format( "Health packs heal {0}→{1} less HP", GetAmountForLevel( newLevel - 1 ), GetAmountForLevel( newLevel ) ) : GetDescription( newLevel );
	}

	public float GetAmountForLevel( int level )
	{
		return 25 * level;
	}
}