Here is the build I use for my monk, but you can use any class. Just bring a skill that gives you extra health, you might need it.

Nightfall PvE only "Fall Back!" 25 15 Shout. For 4..10 seconds, all allies within earshot gain 5..15 Health per second while moving and move 33% faster. "Fall Back!" ends on an ally affected by this Shout when that ally successfully hits with an attack. (Attrib: Command) Nightfall PvE only "Can't Touch This!" 20 10 Shout. For 20 seconds, the next 1..5 touch Skills used against you fail. (Attrib: Command) Eye of the North PvE only Raven Blessing 30 10 Elite Skill. You take on the aspect of the raven. Your Energy returns to maximum and you have -2 Energy degeneration. You have +60..100 maximum Health and 10..30% block chance. All Enchantments upon you are removed. Raven attacks replace your skills. You gain Energy whenever you take or deal damage. This Skill ends when your Energy drops to 0. (Attrib: Norn rank) Eye of the North PvE only Great Dwarf Armor 10 1 5 Enchantment Spell. For 10..40 seconds, target ally has +24 armor, +60 maximum Health, and an additional +24 armor against Destroyers. (Attrib: Deldrimor rank) Eye of the North PvE only Drunken Master 60 1 5 Stance. For 60..90 seconds, your movement and attack speeds are increased by 10..15%. If you are drunk while activating this Skill, your movement and attack speeds are increased by 25..33% instead. (Attrib: Deldrimor rank) Prophecies PvE only Vital Blessing 2 ¾ 10 -1 Enchantment Spell. While you maintain this Enchantment, target ally has +40..200 maximum Health. (Attrib: Protection Prayers)

Monk - Stygian Gem Farm

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. Activate your Lightbringer title for bonus damage and enter Stygian Veil.
. Use Drunken Master and "Fall Back!" to get to the NPCs faster and take the quest and the hunt.
. Move off to the northeast and wait for the Stygian Hungers to appear stop moving in front of the NPCs.
. Activate "Fall Back!" and "Cant Touch This!".
. Aggro the Hungers and run in between the two NPCs, starting from closer to the Hungers and moving away from them.
. Then position yourself directly behind the Adept of Whispers without moving very far away from either NPC.
. Wait there until all the Hungers are blocked by the Adept of Whispers.
. If any enemies begin to attack you or use touch skills on you, but are still blocked by the Adept of Whispers, take baby steps to the left, right, or back to try and avoid getting hit.
. If any enemies move around the NPCs, run away and wait until the Hungers are no longer enchanted to try again.
. Now activate Raven Blessing and spam Raven Swoop without moving. You will start taken damage by Grenth's Balance but dont worry the npc will take alot of the damage for you and you wont die.
. Pick up drops and repeat killing first group.

nice i've gotta try this, would it work on an ele?

<still prefers just 2 trap the first 2 waves :p notthat i eva get gems

i do this with arcane echo searing flames and channeling + skills to boost dmg and kills it VERY quickly ill try raven though looks cool