SS/SV Necromancers are the most popular choice for 2-man Underworld farming.
SS, as said above, stands for Spiteful Spirit, and SV stands for the Mesmer
spell, Sympathetic Visage, which is used for when the 2-man UW party goes
Smite farming.

The purpose of this build is quite simple. The 55 Monk will tank the monsters
in the UW while the Necromancer works his magic with Spiteful Spirit, killing
anything that is stupid enough to attack with the curse on it.

EXAMPLE: Looking for experienced SS/SV Necro for 2-man UW Farming!