These unique Grand Charms allow you to break enemy "Immunities" (Fire, Cold, Lightning, etc.). This opened up dozens of new viable builds that were previously impossible to play in the endgame (Hell difficulty). 4. Cross-Progression
Once you hit Nightmare and Hell difficulty, your resistances take a massive penalty. Prioritize "All Res" gear to avoid getting one-shot.
With one keystroke, you can switch back to the original 2000-era graphics to see how far things have come.
No more "muling" items by dropping them on the ground in private games. You have shared tabs to easily move gear between your characters.