It appears that Diablo II: Resurrected from Alexis's blog

With the Horadric Malus in hand fans can visit Charsi and claim the rewards for completing Tools of the Trade. In D2R ladder items particular, the reward is the imbuement or imbuement of an item, which will add an ability randomly chosen in the equipment piece. It's important to know that players are only able to imbue one item in this fashion so it is recommended that they delay until later in game, once they have better gear before putting it into the Malus.

Diablo II: Resurrected Public Test Realm Launches Tomorrow Ladder Tests Coming Soon

It appears that Diablo II: Resurrected is moving ahead with long-awaited enhancements, as Blizzard has revealed that the games' Public Test Realm (PTR) is scheduled to launch on the 26th of April. At first the PTR will be tested to see how new back-end server items, but Blizzard promises testing of the game's update 2.4 that finally brings Ladder Play, is "coming in the near future."

As we mentioned, as previously mentioned, 2.4 includes Ladder play (Diablo's name for an intense Realm where the progress of everyone is tracked and ranked) and some tweaks to mercenaries, and a variety of tweaks to individual classes. You can get the lowdown regarding mercenaries, ladders, and other mercenaries and also the changes expected to buy d2r items the various classes here.