Note: This can be done on any class, but it’s most comfortable at around 60 speed.
Approach him from the right side or center, circling counter-clockwise. As you approach, gradually make your path tighter and tighter until you’re within 2-5 tiles (Once you get the hang of this, you should be within range by the time you’ve made a 180° “circle” around him.). Using rotation and the left key, circle him and attack. Do not ever stop moving. Using the left key to circle will instantly back you out when confused. When you feel it’s getting dangerous or your health is low, loosen up your path and quickly circle away from Oryx.
If in doubt, circle out. In larger groups, try to be the closest circler, so you draw his fire and he therefore never hits you.