The main goal of this role is to jump in with blink and than pull the whole enemy group into you than spam your two debuffs that lowers their speed, attack speed and cast speed than lock them in while your team spam aoe at them, your job now is to cast your regen on you or invisible if they don't run and focus you instead, if they run, your goal now is to root one of your main target in with curse and blessing which debuff them at the same time making them take more damage, than stun another target with sheild bash to keep them in as well, use the shield bash that silences as well on a mage, than theft someone than go invisible than blink out of the fray if needed, this should already given you team enough time to do what they need to do.
With the health bonus from the buffs from Will and Tanking treeline you get around 1700 Health added with the regen you have and the heal you have, you're pretty much pretty hard to kill if you're tanky enough as well and when the going gets tough just go invisible than heal yourself quickly once the CD is done.