Go 10 summoning, 2 scoundrel and 2 necro for obligatory bone widow, teleport, adrenaline.
Where you go from there is up to you
You can geo for fortify buff + the artillery plant. You can go pyro for haste/clear mind/flame pet or anything else really. I personally dipped into hydro for heals and pyro for buffs. But its up to you.
If you want to save skills, you can go 8 summoning and get items with +summon to reach 10 for the champion incarnate. Champion incarnate needs 10 total not 10 base, so you can save 2 combat abilities there. 10 summoning is more than enough anyway, I'm at the end of the game and I never needed more than 10 summoning.
tp gloves are SUPER handy
Use them to free up 2 skills so you dont have to invest in aero.