Hidden Hand Blade

You have trained extensively in the art of using concealed items and weapons. You gain the following benefits:

• You have advantage on any Dexterity Sleight of Hand check to conceal a dagger, dart or other similarly sized item, on your person. You can only conceal a maximum amount of items equal to your Dexterity modifier with this ability.
• If an item you make an attack with is concealed from your target, then you gain advantage on the first attack roll against the target with that concealed item.
• Before you make an attack with a dagger, dart or other similarly sized item, you can choose to take a -5 penalty to the attack roll. If the attack hits, you add +10 to the attack's damage.