Applying Legendary Aspects to high level weapons
Applying Legendary Aspects to high level weapons requires you to use rare items called Baleful Fragments. These always seem to be in short supply D2R Items, but using the methods below, you'll soon have more Baleful Fragments than you'll know what to do with.
Baleful Fragments are a material item that can be acquired by salvaging Legendary weapons of item power 400 and above. Only Legendary Weapons drop Baleful Fragments when salvaged; you won't get this material from salvaging armor or jewelry.
So, if you need tons of Baleful Fragments, there are a few methods you can use. You can find Legendary items in most content in the game, but the following methods will save you some time if you're looking specifically for Legendary weapons.
Helltide
The Helltide world event is one of the best ways to find Legendary items. These events occur in World Tier 3 and above, but aren't always active. When they do start, you'll have one hour to participate. During a Helltide, killing enemies in the area will make the drop Aberrant Cinders, which you can then spend to open Tortured Gifts found throughout the map.
Tortured Gifts can hold specific items inside, indicated by their name. For example, a Tortured Gift of Weaponry has weapons in it, with a high chance of receiving a Legendary weapon. This is one of the best ways to get specific types of gear D2R ladder items buy, making farming for Baleful Fragments much easier.