I have 20 or more im my trashbox and ZERO dehate (which might be usefull) And beside of the Mesa Adornment of Aggressiveness i got a lot of useless Mesa Adornment of Willpower in the soloinstances (killing the last named graceless) too BTW: /westernsalute turns the buff on for the trash and off
This list from EQ2U shows all of the current expansion hate gain adorns. Plateaus and Hizite are crafted. Scavengers and Mesa are dropped. I'm not sure about Badlands. You can also get Aggressiveness adorns from VoV that have lower hate mod, but also have fervor overcap (none of the RoR adorns have fervor overcap). This other list from EQ2U shows the VoV adorns, all of which are player-crafted.
You have the +77 hate gain +12 fervor overcap that goes on the gloves. There is +79 one from RoR which does not have fervor oc. You also can get the level 100 +15 hate gain that can go on to your wrist, hands or charms.