Bandit Locations and Their Rewards
There are three bandit leaders, each located in Path of exile currency different areas of Act 2. Killing them grants their amulet, while helping them gives you a permanent bonus.

Helping Kraityn
Location: Broken Bridge (accessible via Crossroads).
Bonus: +8% Movement Speed, +6% Attack and Cast Speed, +3% chance to Dodge Attacks.
This bonus offers increased speed and evasion, making it great for classes that rely on mobility or attack speed. However, once you reach the endgame, the 8% movement speed may be outclassed by cheap POE currency other buffs.