Son of Sethe

This little known pet is vampiric and as a consequence has occasionally proven himself worth his weight in gold in some fights having caught my opponenents by surprise. Some people haven't gotten on with him as much but used well he causes a lot of damage against certain teams.

Like @Vek said. This pets healing ability is almost unmatched... and because of this you should use it to your advantage. Get Immolation, Death and Decay, Swarm of Flies, Coin/Rock/Egg/Bone barrage up with a different pet, bring in Little Son of Sethe(cast Plagued Blood) and watch them heal up. (In addition if you choose to do Scorched Earth it does less damage to undead which would make the new Firewing and Blazing Firehawk love you.) 

A solid pet to have in an undead line up. This thing has so much healing utility it can be tough to kill unless you're hitting very hard. With Unborn Valkyr spear heading this pet is awesome against humanoid types. 

Another solid undead pet. This is especially great when used with turret/immolation/DoTs/DnD/Barrages and Plagued Blood/Touch of the Animus. This will heal your pets to no end. With Touch of the Animus up your own Drain Blood will almost fully heal the Son of Sethe. I have seen some use Absorb to good effect but I prefer Plagued Blood.

I have mine to level 20, and he's wonderful in battle.  Heals, heal, heals, with decent damage.  LOVE him.

If you get the level 3 trade post, that rep token will give you 3k rep a pop

Same here i read that you need to hit level 100 and grind for the rest 

I did all spires quests and thought Talador but I am only in Honored, need to check Talador and see if I missed some quests, hoping the note is correct about Reputation and quests.