We spent a few more days on the boss, I finally chose SV for the next phases, here is the way we do it :
- I don't hit the boss until the first engineer spawns (but my pet does) (first 20 seconds)
- I land an ice trap under the adds before the engineer spawns
- I kill the first engineer alone
- I go on the boss, use CDs...
- I kill the second engineer with our restoration druid
- The boss is usually below 10% a few seconds before the third desecrate/adds wave
By the way, I can say that even if the pet doesn't attack anything before the engineer, he doesn't teleport behind the engineer (with BS talent enabled, ofc)
If someone wants the proof, I can get it from my records.
Oh and by the way, thank for the replies !