I've played a Grav/Eng Dom to 22, and the endurance drain is nominal, i've taken stamina out of force of habit 
But i don't think it would be necessary, but for longer fights, can be very, very useful 
Attractive Force is Grav/Eng got her up to lvl 17 and enducance hasnt being an issue.
Even when soloing can quite easily get through a fair few mobs b4 having to stop and rest.
ok I think i'd rather get fitness stamina near 26/28.
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ok I think i'd rather get fitness stamina near 26/28.
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Definately a sound plan of action
I'd think that it would depend on how you use your secondry. If you're going to use the melee attacks more EN can be an end burner (have mind/en) Not sure about grav, but doesn't seem THAT heavy.
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
No melee ; I use energy pool in order to knockback my opponents. I don't wanna be a damage dealer (could I ? don't think so)
I'll take hasten at lv6 to have a perma control on my mobs.
I think I'll need to group everytime I'll play but is that disturbing ? again, I don't think so
edit : forgive my english if you can't understand what I mean ; I'm french but this dominator thead is more active.
You can deal damage, and some serious damage at that 
Domination is great for PvE as when it's activated the stunning powers from Bone Smasher > Energy Punch are increased, making crowd control a lot easier
If you're using propel, or possibly lift (I don't have it on my current grav/enr) you might want to pick up stamina. I personally got it at 28 and haven't regretted it, but is it vital? Ehhh... probably not really. I'd say it's up to personal preference.
I eat through endurance like it's going outta fashion with my Gravity/Energy build. Fitness is a must for me with powers like Total Focus being so nice
I'm going to build a grav/en dominator but I'd like to know if he use a lot of stamina --> do I need the fitness pool ?
Which aux pool shall I get ?
thanks