Energy Drain

im thinking about of doing the energy drain build but my only question is, will i regret not maxing out shockwave later on? If theres not a big regret ill max energy drain

I regret maxing shockwave instead of energy drain. Odds are you won't really care about shockwave much in 4th.

Well my question is, if I do go with the energy build, what should I do about stun mastery and drain? What should I do first or what order should I go in because I was planning on going stun mastery+2 and EC+1 every level until stun mastery was maxed. Then I was going to finish the energy build. Any suggestions on what I should do after EC is maxed or if it shouldnt be maxed before drain? So confused xd....

Typical energy build is something like:
Energy Charge +8/12/xx (to whatever level you're satisfied with, depending on your taste for charge time)
Energy Blast to 11

After this, add to each as you choose. If you want faster charge times and are satisfied with hitting 3 enemies, get more charge. If you want to hit 4 enemies rather than 3, then get blast to 21. Which path you choose depends on where you train for the most part. After you've decided which to go, and have max Charge and 21+ Blast (whether or not you max it at this point is again up to you), start adding into drain.

Theres room for flexibility, depending on your own tastes. Lv1 Drain will last quite a while, so I wouldn't put more than one point into it until both of your other energy moves are high enough. If you follow this build, you should put one point in blast and drain early on, so that charge is actually usable.