I've got tons of extra legendary and set items and I don't know what to do with them. What are my best options? Just salvage them?
If you are playing patch 2.3 or later you can extract the legendary powers in kanais cube. http://www.diablowiki.net/Legendary_affixes
If you are playing 2.4 or later you might want to keep the set items to do the set dungeons. http://us.battle.net/d3/en/blog/19941042/patch-240-ptr-patch-notes-12-14-2015
Otherwise just salvage the ones you don't use.
Yep, salvaging unwanted legendary and set items will yield 'Forgotten Souls' which are handy for use in Kanai's Cube. Don't forget you can strip the legendary power from them in the cube, so if you haven't already, strip the powers of any you don't want. There is an achievement for doing this.
As they can be used to upgrade rare items to legendaries, re-roll items and other useful things. They'll also be required to re-roll stats on legendary and set items at the mystic.
In the cube, these recipes require souls.
- Reforge Legendary Item
- Convert Set Item