another nifty idea

ranger/mesmer

Greater Conflagration [elite]
Create a level 1-8 Spirit. For creatures within its range, all physical damage is fire damage instead. This Spirit dies after 30-126 seconds.
Nature Ritual - 5 energy - 5 cast - 60 recharge

plus

Winter
Create a level 1-8 Spirit, all Elemental damage is Cold damage instead. This Spirit dies after 30-126 seconds.
Nature Ritual - 5 energy - 5 cast - 60 recharge

plus

Mantra of Frost
For 30-78 seconds, whenever you take cold damage, the damage is reduced by 26-45% and you gain 1 Energy.
Stance - 15 energy - 0 cast - 20 recharge

plus

Frostbound Set
Level 20
4 Pieces: Boots, Vest, Gloves, Leggings
Armor: 70AL +30AL vs. Elemental Attacks +15AL vs. Cold Attacks

would be taking very minimal damage from allmost all attacks.

sub in other skills as you see fit.

posted a ranger/mesmer team build using this a long time ago on gwo. Since then, Rangers in general, Nature Rituals and Mantras have been nerfed. Used to be a much more worthy idea, now I doubt it'll be efficient.

Yeah, this used to be a pretty common build idea. I never hear of it being used anymore, probably since Jan/Feb beta.

this isnt used any more mainly due to the silly AoE that nature rituals have. good idea though, used to be a few of these around.