what is the most optimal stat distribuition on a Emberquake build on Synergies, straight Focus? straight Str? sould i pump Dex?
1H+Shield or 2H?
i'm looking for one that can tackle end game content on Elite
If your goal is the hardest content (Darkness Falls) i would recommend you go with:
Rest in STR
Once you start to gear up in Darkness Falls gear you will be able to customize your stats, which is why i recommend you go for at least 200 vitality, you will ALWAYS want a large health pool so those 200 vitality is quite helpful especially since Vitality has an upscaling curve (the more you have the more health you get per point), you will also need health from more than just gear alone, you also want dex, it will save precious special enchants and give you enough early dodge that it will make a difference, focus you can go with 0-80 since you can get 1000+ anyway when you get mythical skulls and STR will always be wanted since you should aim for the 500% crit cap.
These stat distributions are based on saving as many special enchants as possible for your character and making sure you can progress in Darkness Falls, which is why the 200 Vitality is such a good start as it will help you with the early health problems you will face in Darkness Falls due to the debuff ( -7000 Hp) and it also saves health special enchants.
For Darkness Falls imo the best set for the Engineer is the Residual Aftermath set, allows you to proc aegis for up to 200k absorb, can go even higher when everything is up but that's rather rare.