NB Tanks are extremely self sufficient. You've got self heals for days, resource replenishing skills, shields, and more. Using back bar buffs, and a front bar ultimate slotted only for sustaining resources you will easily tank most content with ease. Your backbar is set up for clearing trashpacks (and buffing) while your frontbar is your Heal, Debuff, Taunt, Pull & Shield ... If you dont care for the silver leash "pull" you could always slot Revealing Flare from the Alliance War skill line for reduced overall damage.

( Vampire & WW Skill Lines are both Optional ) Frontbar builds ultimate, just slot the transformation on backbar.