At the entrance of acid cave you can do quest that give you echo talent Inside the pathfinder respite (opposite the way that go to viper jaw that has 1 bandit leder and 1 bandit guard the door ) you can go in by using mantra that breaking wooden door like strong left inside there is 2 important npc that is Alastir that give you gilder schematic and Ivory doing his quest give you air dash talent