Rangers can farm, just very poorly.
16 Wilderness Survival
14 Expertise
5 Beast Master
Quickening Zephyr
Energizing Wind
Spike Trap
Barbed Trap
Flame Trap
Dust Trap
Plant the two spirits, plant all of the traps in front of them, and aggro a bunch of Melee mobs. Use Dryder's Defenses or Whirling Defense to get them all bunched up on you and run toward the spirits, they'll aggro onto those and die from the traps.
It's godlessly slow, especially compared to Monk farming, but you can do it. The trolls outside of Droknar's Forge are workable, but you won't get much loot from them.
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