Xp run question?

[Marrypoppins]

I wanna lvl my 15 op as fast as possible w/o wasting combo elixir which map is best for xp runs? And where do I rmk also on a side note which skills are most important on a op? Thanks so much in advance

[BodMaster]

I wanna lvl my 15 op as fast as possible w/o wasting combo elixir which map is best for xp runs?

Delta Dead Man Runs - Easily completed until Lvl 19 then move on to Numa Outer Limits (Skip boss if solo or small group.. not worth the XP just for boss)

And where do I rmk?
Delta Dead Man - Or are you referring to the process to do this?

Also on a side note which skills are most important on a op?

Skills are not the best for Op esp at that level and my main is a Com so maybe someone else could answer that..