Hunters do not need a buff, you just need to make a build for yourself to survive and there are plenty of builds that are endgame viable with survivability. You wanna survive? Devour - void like you listed, however lemme give you another way. Pure Solar, use Ember of Empyrean with a healing nade. Just continue using Solar weapons and abilities to keep the restoration buff going. Woven mail - Hunters have the freeest way of getting woven mail via Exotic class gear or from the Cyrtarachne's Facade states using your Grapple nade gives you Woven mail on demand. I do not play Hunter, however I have seen plenty of ways of surviving in this game from all 3 classes. Some have advantages over the others making them stand better. Experiment with the game or look up some guides if you do not want my opinion. Have a blessed day.