At around level 40 you get a quest called "corrosion prevention" (at zeplin crash grounds near tabetha)where you get an item "ooze buster". Well, basically all you do it get in the range of these energy blasters that give you enough power to kill these oozes. If you tag these oozes first and use the buster, you still get exp and you pretty much kill the oozes without doing anything. There are plenty of these oozes around this place and is good to grind.