My personal advice to you would be: Power Mastery all the way...
@41: Power Build Up - amazing power. Not only does it work like a regular Build Up (+DAM, +ACC) - but it also boosts all your other effects like heals, regen buffs, defense buffs, endurance buffs/drains, disorients, holds, immobilizes, knockbacks... even your run/flight speed. ((Red Tomax Guide values))
Get it. Slot it. Love it.
@ 44: Conserve Power - once this is slotted, you'll never run dry in a firefight again.
@ 47: Total Focus is Extreme damage and adds one heck of a punch - as well as the slam-dunk Disorient - and can get you out of a lot of trouble.
@ 49: your choice. Temp Invuln isn't really up to much - as an empath, your Aura heals should give you plenty enough regeneration to outweigh this. But it does give you more survivability. For an equivalent amount of END, you might consider Maneuvers to give your whole team a decent extra little buff.
Is it time for the dance of joy yet?
I have reached level 41 with my empath
and im not sure which to choose from...
... a new power pool set choosing leadership or choose electricty from the epic pool, which i can choose a power with extreme damage.