There is a new reason why not to delete your mesmer!
Introducing.... The NEW and improved Mesmer solo farmer! (yay...)
(Idea developed from New Age Monk build as well as looking at the new Nightfall skills)
Mainly, the build is based on Signet of Illusions- "Your next spell uses the illusion attribute instead of it's normal attribute"
Attributes:
Illusion Magic: 16 (12+3+1)
Fast Casting: 12 (9+3)
Inspiration Magic: 4 (1+3)
Protection Prayers: 9
Weapons: Totem Axe and -50 Grim Cesta
Skills:
Signet of Illusions {e}
Protective Spirit
Shield of Absorption
----------
Retribution
Mending
Balthazars Spirit
Blessed Aura
Alright this might be pretty slow but it's the first stage of the build so bear with me.

First, when you spawn, cast Signet of Illusions followed by Mending and than Signet of Illusions followed by Blessed Aura. Now cast Balthazars spirit and than Signet of Illusions followed by Retribution. Now you are "super-awesome"

I can't think of a consistent dmg source that isn't an elite (i.e. with Signet of Illusion I can't bring along Shield of Judgement or Illusionary Weapon). I suppose you could sit there and let retribution pound your enemies but 33% of 5 dmg... it isn't much at all and most enemies regen counters that

So.... at this stage of the build you can only use it to duo farm places with an SS or Famine ranger (if you swap retribution and the blank spot for ss/sv.)
Well, this isn't much of a build after all but that's why it's a CONCEPT farmer. Any suggestions/comments would be nice.

The Phantom