What should I look for in a pet?

[Teasajah]

Hello everyone! It's been about 20 days since I started playing this game and I am really inexperienced.

I am currently a level 53 mage in the game and I'm looking for a pet combo which will cost me around 400-500k. I read all threads in the first page of "Pets" forum but the information I found were mostly not about mages/PvE and pets which people say that are cheap were above 1m gold!

So as a PvE mage I wanted to ask you what should I look for in a pet's:

1-Passive
For example I did not understand why would I need boss stunner until I found someone who says it interrupts bosses red zones.

2-Happiness
I am currently using Loki since it gives %15 damage bonus. Since Loki is 5k, it looks like damage is not so important! So what is important for happiness? I have no idea about this.


3-Arcane Ability
I was using Frost until today and I only used AA just once!(I was dueling a warrior, thought it would be a good idea to keep him away from me, haha.)
Other than that people say Gyrm is a good idea, but I don't understand why would a mage need crit?

With the information I get from here I will try to make a pet combo for 500k~, if you have a direct suggestion for this mage PvE pet combo please explain why and how do I use it.

Thank you very much!