Mesmer - Conditions, Clones, and Phantasms (Reddit, Youtube)

Reddit post: (discussion thread)
Youtube links: (part 1) (part 2)

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In summary:
Weapons:
Main staff, swap to sword/focus as backup.

Traits: 20/0/30/0/20
Domination:

• Mental Torment (I) note: some people prefer to take Empowered Illusions (III)
  
• Crippling Dissipation (V)

Chaos:

• Debilitating Dissipation (V)
  
• Chaotic Dampening (X)
  
• Illusionary Defense (IV)

Illusions:

• Illusionary Elasticity (VII)
  
• Compounding Power (III)

Playstyle:
Lots of clones/phantasms, apply lots of conditions/boons.