This take on the Obsidian Flesh farmer is tailored mainly for caster mobs, as it prevents spellcasting while completely mitigating their projectile damage before obliterating them with Mesmer hexes.
EotNElementalist. Air Magic 2Glyph of SwiftnessGlyphFor 15 seconds, your next 2 Spells recharge 25% faster, and projectiles from those spells move 200% faster.5110
CoreElementalist. Earth Magic 16Obsidian FleshElite Enchantment SpellFor 21 seconds, you gain +20 armor and cannot be the target of enemy Spells, but cannot attack and have -2 energy degeneration.25130
NightfallElementalist. Earth Magic 16Stoneflesh AuraEnchantment SpellFor 16 seconds, damage you receive is reduced by 33, and you are immune to critical attacks.10215
NightfallMesmer. Domination Magic 12Wastrel's DemiseHex SpellFor 5 seconds, target foe is hexed with Wastrel's Demise. Each second while hexed, target foe and all foes adjacent to that foe take 8 damage and an additional 8 damage for each second this spell is in effect. This hex ends prematurely if target foe uses a skill. 5¼3
PropheciesMesmer. Domination Magic 12Wastrel's WorryHex SpellAfter 3 seconds, target foe and all adjacent foes take 84 damage. Wastrel's Worry ends prematurely if that foe uses a skill.5¼1
Template code
Options for slot 4 - Energy Management
If you are reliably getting hit with elemental damage, bring:
Mantra of EarthCoreMesmer. Inspiration Magic 2Mantra of EarthStanceFor 38 seconds, whenever you take earth damage, the damage is reduced by 29% and you gain 2 Energy.1020 (add Stone StrikerNightfallElementalist. Earth Magic 16Stone StrikerEnchantment SpellFor 32 seconds, whenever you take or deal elemental or physical damage, that damage is converted to earth damage.5¼20 for non-elemental foes)
Mantra of FlameCoreMesmer. Inspiration Magic 2Mantra of FlameStanceFor 38 seconds, whenever you take fire damage, the damage is reduced by 29% and you gain 2 Energy.1020
Mantra of FrostCoreMesmer. Inspiration Magic 2Mantra of FrostStanceFor 38 seconds, whenever you take cold damage, the damage is reduced by 29% and you gain 2 Energy.1020
Mantra of LightningCoreMesmer. Inspiration Magic 2Mantra of LightningStanceFor 38 seconds, whenever you take lightning damage, the damage is reduced by 29% and you gain 2 Energy.1020
Otherwise, just use ChannelingPropheciesMesmer. Inspiration Magic 2ChannelingEnchantment SpellFor 14 seconds, whenever you cast a Spell, you gain 1 Energy for each foe in the area.5115.
Options for slots 5 and 6
Radiation FieldEotNNo Profession. Asura rank Radiation FieldWard SpellFor 5 seconds, foes in the area have -4..6 Health degeneration. When the portal ends, foes in the area are Diseased for 12..20 seconds. PvE only.15212 - effective degen against fleshy enemies
Sliver ArmorFactionsElementalist. Earth Magic 16Sliver ArmorEnchantment SpellFor 11 seconds, you have 52% chance to block attacks and whenever you are the target of a hostile Spell or attack one nearby foe is struck for 37 earth damage.10130 - good damage if you have a lot of aggro
Cry of PainNightfallMesmer. Sunspear rank Cry of PainSpellInterrupt target foe's skill. If that foe was suffering from a Mesmer Hex, that foe and all foes in the area take 25..50 damage and -3..5 Health degeneration for 10 seconds. PvE only.10¼15 - strong degen and an interrupt to guarantee Wastrel's triggers
Arcane EchoCoreMesmer. UnlinkedArcane EchoEnchantment SpellIf you cast a Spell in the next 20 seconds, Arcane Echo is replaced with that Spell for 20 seconds. Arcane Echo ends prematurely if you use a non-Spell skill.15220 - to copy a skill (usually Wastrel's DemiseNightfallMesmer. Domination Magic 12Wastrel's DemiseHex SpellFor 5 seconds, target foe is hexed with Wastrel's Demise. Each second while hexed, target foe and all foes adjacent to that foe take 8 damage and an additional 8 damage for each second this spell is in effect. This hex ends prematurely if target foe uses a skill. 5¼3)
Armor of EarthCoreElementalist. Earth Magic 16Armor of EarthEnchantment SpellFor 30 seconds, you gain 62 armor, but move 12% slower.10¾15 - increased armor; can also replace Stoneflesh AuraNightfallElementalist. Earth Magic 16Stoneflesh AuraEnchantment SpellFor 16 seconds, damage you receive is reduced by 33, and you are immune to critical attacks.10215
I Am Unstoppable!EotNNo Profession. Norn rank "I Am Unstoppable!"ShoutFor 16..20 seconds, you have +24 armor and cannot be knocked down or Crippled. PvE only.530 - in areas with KD
Dwarven StabilityEotNNo Profession. Deldrimor rank Dwarven StabilityEnchantment SpellFor 24..30 seconds, your Stances last 55..100% longer. If you activated this Skill while drunk, you cannot be knocked down. PvE only.5¼30 - perma anti-KD if you use alcohol
Elemental LordFactionsElementalist. Kurzick rank Elemental Lord (Kurzick)Enchantment SpellFor 40..60 seconds, your elemental attributes are boosted by 1. Each time you cast a spell, you gain 1 Energy for every 10 ranks of Energy Storage and are healed for 100..300% of the spell's Energy cost. PvE only.10¼45 - higher Earth Magic for longer Obsidian FleshCoreElementalist. Earth Magic 17Obsidian FleshElite Enchantment SpellFor 22 seconds, you gain +20 armor and cannot be the target of enemy Spells, but cannot attack and have -2 energy degeneration.25130 and passive healing
Feel No PainEotNNo Profession. Norn rank 10Feel No PainSkillFor 30 seconds you have +3 Health regeneration. If you are drunk when activating this Skill you also have +300 maximum Health. PvE only.520 - to sustain minimal degen
MindbenderEotNNo Profession. Asura rank MindbenderEnchantment SpellFor 6..16 seconds, you move 20..33% faster and your Spells take 20% less time to cast. PvE only.5124 - increased mobility and reduced casting time
Equipment[]
Weapon - The highest energy staff you can afford with a 20% Enchanting mod.
Armor - Blessed Insignias on all pieces.
Usage[]
Maintain Obsidian FleshCoreElementalist. Earth Magic 16Obsidian FleshElite Enchantment SpellFor 21 seconds, you gain +20 armor and cannot be the target of enemy Spells, but cannot attack and have -2 energy degeneration.25130 at all times by using Glyph of SwiftnessEotNElementalist. Air Magic 2Glyph of SwiftnessGlyphFor 15 seconds, your next 2 Spells recharge 25% faster, and projectiles from those spells move 200% faster.5110 to reduce its recharge time.
Maintain the Mantra stance you chose (and Stone StrikerNightfallElementalist. Earth Magic 16Stone StrikerEnchantment SpellFor 32 seconds, whenever you take or deal elemental or physical damage, that damage is converted to earth damage.5¼20 if Mantra of EarthCoreMesmer. Inspiration Magic 16Mantra of EarthStanceFor 94 seconds, whenever you take earth damage, the damage is reduced by 52% and you gain 2 Energy.1020 is taken) for energy gain and damage reduction.
Maintain StonefleshNightfallElementalist. Earth Magic 16Stoneflesh AuraEnchantment SpellFor 16 seconds, damage you receive is reduced by 33, and you are immune to critical attacks.10215 to further reduce damage.
Once the mobs balled up spread Wastrel's hexes among them.
Mantra of Earth (add 
Stone Striker for non-elemental foes)
Mantra of Flame 
Mantra of Frost 
