Tanks are usually W/Mo’s that are there to soak up the damage and take monster
aggro by using a combination of Stances, such as Defensive Stance, Shield
Stance, Gladiator’s Defense, etc., and use Enchantments given from Monks such
as Protective Spirit, Vital Blessing, Guardian, Aegis, etc. Tanks are not
there to give out damage, but rather letting monsters hit them instead of
the softer targets, such as Elementalists, Monks, and Mesmers. Tanks will
usually have a very high Hit Point count, usually around 800+, and can even
go past the 1,000 mark.

EXAMPLE: Tank LFG for UW.