For three seasons, now four, we have had the really cool seasonal power interface where we slot in our powers and level them up. Cool, who doesn’t love that? People only hate that when a season only brings in a big seasonal theme but no base game content/endgame.
However in the interview that the D4 director had with Rhykker, he stated that Horadic powers are very specific to the Horadrim. No vampire powers? No Witch powers? No Boss powers? What does a Horadric power even look like? How do they differ from other seasonal powers? As a D4 lord nerd here are some clues.
Horadrim scrolls: These are likely seasonal scroll that once learned the player has access to unique/seasonal/powerful tempering recipes, such recipes may take a temper slot, or they may in fact count as a 3rd temper. The devs have stated back in season 4 that they want to test and experiment new tempering recipes in the form of seasonal mechanics.
Horadric Cube: Everyone (Especially me) has been asking for this. Season 9 could be the season we get the Horadric cube which would revolutionize the depth of crafting to 11. This would also be a base game crafting system. I do not need to explain how it works. You put the white item in; you put some gems and runes in and click the bottom and bam! White item is now blue item. Do it again and you get a rare.