It's the class set pieces, including the old 60 sets which were made torment only just before RoS went live. This is Inna/Natalya/IK/Tal Rasha/Zunimassa as well as the newer sets Firebird/Vyr/Marauder/Akkan and whatever the others are I don't know all the names. Any 4-6 set that has class specific set bonuses on them, a bunch of which were added for ros. This doesn't include non class specific sets, such as blackthorne or even danetta xbows(even though they're technically DH only, they're not considered a class set). Other than that, there are the bottomless potions and the follower legendaries(the ones that makes them not die and the ones that give them all the skills at once). Besides those items, everything drops out of torment, with some items apparently bugged/removed for now(such as Yan Hexing Pants and Moonward amulet which don't drop anymore). Oh and there's also a bunch of cache only legendaries that only drop from bounty caches, but you probably know that.