PlainOldCookies

When making an attack that would miss with Great Weapon Master's -5 to hit penalty, you can react for free to negate the hit penalty and damage bonus, which can potentially result in your attack hitting.

In dialogue skill checks, use the highest modifier in your party.

When you complete the quest, "Investigate the Murders" in Act 3, you recieve a Bhaalist Armour.

You gain an Infernal Robes when meeting Mizora for the first time, regardless of her judgement.

Sceleritas Fel gives you a Potent Robe, as well as the usual Deathstalker Mantle when you first meet him.