You've learned how to use the cover of darkness and the element of surprise to your advantage. Here are the benefits of this feat:

• You can attempt to hide when you are only lightly obscured from the creature from which you are hiding.
• When you are hidden from a creature and miss it with a ranged weapon attack, making the attack doesn't reveal your position.
• You gain darkvision up to a range of 30 feet. If you already have darkvision, its range increases by an additional 30 feet.

The Shadow Walker feat enhances your ability to remain undetected, take advantage of dim lighting and shadows, and improves your vision in the dark. This should be a good fit for characters who rely on stealth and subterfuge.