Another tip is use SHADE pet with GHOST Mod, this will keep any char invisble, long as you dont attack anything. make sure to un equip the shades gun slot, and also remove vacuum type mods on pet so it doesnt accidentally grab energy orb to you
Use Ivara and stroll thru the map, aslo use ping sound arrow shoot far away awalls to lure enemies away out of your path. due a survivl mission, and stroll around grabbing the air pylons till you get to the exit after the 1st round completes 5 minutes, no kill stealth run. stroll with shade invis the whole way. it will keep your ivara invis if worried she will run outta energy along the way. also equip her with energy mod and energy arcane, those are not consider consumable to keep her regen up, aslo zenurik can operator sling to make a energy regen circle doesnt count as consumable either.
If you get riven with just kill x number enemies without using energy consumable its real easy, just to to plains of eidolon in the day, hop in your archwing and bring whatever weapon u like preferably one shoots long range and have at it, till you get your kill count then exit the zone