Buying a Mercenary can greatly enhance your experience in D2R, bringing you versatility and survivability, buying one of D2bits Merc Bundles, transforms your Mercenary from being a liability and causing you frustration and Gold cost reviving them all the time, to a core piece of your build being a real life saver, with his Damage,Aura's and tanking.
To heal your mercenary - which is especially useful early game, you can drag and drop a potion on the portrait or Shift + Right click a potion and it will instantly heal them too.
The Bundle Includes,
Pride Ethereal Thresher
Ethereal Archon Plate Chains of Honor
Ethereal Vampire Gaze
The damage reduction and life steal from Vampire Gaze and Chains of Honor will keep him alive for a long time.