Images:

gw2-chalice-of-gods-focus-1gw2-chalice-of-gods-focus-2gw2-chalice-of-gods-focus-3

Set:

Slot Item Name Trading Post Preview Code
Focus http://db.dulfy.net/item/47084 GW2 TP [&AgGDaQAA]

Where to Obtain:

Random drop from mystic forge (by combining 4 Level 75+ rare/exotic focuses)
This skin can also be acquired from Lakor Grizzlemouth in Diessa Plateau – Village of Butcher’s Block after you assist him (karma vendor).

Particle Effects:

Cloud effects from the cup.