Priest tank

The priest tank is an ultra-defensive build that uses an aura that weakens enemies. For aura, your options are:
 * Devotion decreases enemy attack speed, sometimes to as low as 0.5.
 * Condemn decreases enemy attack damage. It can sometimes decrease the damage sufficiently to let everyone survive.
 * Retribution: Against high-damage enemies, this can deal considerable dps.
 * Voodoo makes enemies attack themselves sometimes, effectively granting your party evasion and adding some dps.

Your tanking suite of skills is: Shield Mastery, Holy Shield and Dragon Blood. If you want to farm with thus build, you can get Zeal.

Weapon Mastery is also useful as it lets you deal proper damage.