Hello there,
[Ivara Prime] is one of the most valuate frame.
She can do actually everything with ease.
This build is made especially for spy mission but you can take it wherever you want, you will succeed.
Highest possible Efficiency and above 100% Duration will give you low Energy Drain per Second while in Prowl, and high Range will give you very nice Steal Effectiveness when you pass nearby unsuspecting enemies.
You can use melee or range weapons but be sure they are silent/hushed and/or Artemis Bow.
Suggested Companion would be Sentinel with its Sentinel Weapon with four Vigilante Mods on it.
Suggested arcanes are [Rage] and Acceleration.
Also check my shared builds:
Moon Jelly (Config A)
Bloody Bride (Config B)
Enjoy, THeMooN85