Rebirth is coming to Diablo 4, so can we have these 3 features next?
A little challenge, a lot less salvaging, and one very rich goblin.

Rebirth is coming to Diablo 4 with Season 15, assuming the feature will be part of the next season without any big changes since PTR or to the system as we know it in general. Instead of creating another character from zero, you will be able to move an Eternal character into the Seasonal Realm and reset it to Level 1, keeping its name, appearance, cosmetic preferences, and total time played (if it still works like it did in Diablo 3).
It is an idea that longtime players will naturally recognize right away from Diablo 3. With Legacy Uniques returning as well, and the Armory and Horadric Cube already adding more pieces of older Diablo games into Diablo IV, Blizzard is clearly happy to look back at the franchise and see which old feature could still make sense.
So, if that door is already open, here are three more classic Diablo features we would happily take.
Talisman Sets Could Unlock Their Own Mastery Dungeons
Diablo 3 Set Dungeons were fixed challenges built around individual class sets. Once you equipped all pieces of a set, you could track down the related dungeon and complete objectives based on how that set worked. Mastering a Set Dungeon also came with exclusive cosmetic rewards.

They had their annoying moments, especially when an objective worked against the way you normally played the build. But the main idea was pretty good. Instead of only collecting a set for more power, you were asked to prove that you understood how it worked.
Diablo 4 could adapt that idea through the Talisman system. Completing a full Set of charms could unlock a dedicated Mastery Dungeon built around its main effects. For example, a standard clear could grant an achievement or title, with full mastery rewarding something more exciting, such as wings, a portal skin, mount armor, or even a pet.
The important part would be keeping the rewards cosmetic. Nobody should ever feel like they need to master one of these dungeons for a best-in-slot charm. It should just be a fun side challenge for anyone who enjoys the set or wants something new to collect.
The Season 15 PTR already tested Challenge Dungeons, so part of the foundation could even be there, at least partially. On the PTR, those were selectable boss encounters rather than build tests, and they only had one boss room. But Blizzard also confirmed that the finished Season 15 content will be different from what appeared on the PTR, so this is all just a fun comparison for now.
Let Our Pets Take Care of the Salvage Pile
Diablo 4 pets already collect gold and materials, but Diablo 3 eventually gave them another very useful job. Through the Altar of Rites (which was added in later seasons), pets could pick up and automatically salvage common, magic, and rare items.

Copying that feature exactly would not do all that much in Diablo 4. Lower-quality equipment already converts into materials once you reach Torment. But Blizzard could take the same idea and instead connect pet salvage directly to the loot filter.
If your filter hides an item, your pet could collect and salvage it after a short delay. Uniques and Mythics should always be protected, and Legendary salvage would need to be something you explicitly enable.
Besides just saving you from another trip to sort through the loot pile, this could also help with all those hidden items that still appear on the map and minimap. The loot filter would feel much more complete if our pets cleaned up everything we already told the game we did not want.
It would not be the biggest "feature announcement" in the world, but it is still something that most players would likely appreciate every time they play.
Give the Horadric Cube Its Own Puzzle Ring Portal
Diablo 3 had a very cool feature: it gave unwanted Puzzle Rings one of the best second lives an item could ask for. Placing one by itself into Kanai's Cube destroyed the ring and opened a portal to the Vault, a treasure realm full of gold, goblins, and Greed herself. Even better: if you used an Ancient or Primal Puzzle Ring, it would open the Ancient Vault instead, filling the realm with even more goblins and much better rewards.
Diablo 4 now has its own Horadric Cube, as well as six special Treasure Goblin variants that are already running around Sanctuary. It would feel like the right home for a new version of this Puzzle Ring portal idea.
A regular Puzzle Ring could open the Vault, with an Ancestral version unlocking a harder and more rewarding version. Blizzard could fill it with waves of different goblins before ending the run with Greed, Avarice, or even a new boss specifically created for the realm.
This would not need to interfere with the secret cow-level either. It could just be a separate, repeatable treasure realm and a fun use for a rare item that you have to sacrifice to enter.

None of these features is supposed to reinvent the Diablo 4 endgame, which is the whole point. One gives Talisman sets a new purpose, one makes the loot filter even more useful (in combination with pets), and one lets us throw a ring into the Cube in exchange for an unreasonable number of goblins. All in the name of simple, good fun.
Which one would you bring back first? Or would you rather see a completely different feature from older Diablo games come back?

