[Ivara] is a huntress based frame with a myriad of build options. This build focuses on her Artemis bow's augment, concentrated arrow and its ability to proc massive bleeds in a room-wide AOE when you land a headshot.

Core:

Strength mods including two conditionals for boosting 4's damage and the damage boosts from eclipse and prowl. Due to two of her skills being channeled, you only need to match the conditional requirements twice, on cast at the start of the mission.

Range mods might seem a bit low initially but considering [Primed Firestorm] can be equipped on the [Artemis Bow], you don't need to go overkill in that aspect on the build. [Primed Firestorm] stacks additively with range mods.

Due to primary weapon arcanes not being equipable on the [Artemis Bow] arcane [Rage] is a decent boost to DPS.

The exilus mod is a flex slot. [Synth Reflex] is very useful for keeping your secondary reloaded and making you not waste time swapping weapons to prime enemies.

Alternatives: [Augur Reach] can be swapped for [Overextended] for a boost in range although due to the [Firestorm] interaction I advise against this. [Augur Secrets] can be swapped for [Transient Fortitude] but it makes the build fairly uncomfortable to manage for. Arcane [Rage] and [Synth Reflex] can be swapped for Arcane Consequence and Firewaker if you plan to be spamming roles while invis or breaking invis for mobility. Empowered quiver offers a massive crit damage boost at the cost of making your playstyle almost completely stationary.

Non-alternatives: [Enemy Radar]. [Ivara]'s passive makes it redundant. [Power Of Three]: this mod is absolutely horrid. Infiltrate: This mod slows you down (As walking with it even on 300% strength is still slower than spamming rolls/dashes) and the laser gimmick just saves a few seconds in spy vaults. It's a learning spy learning tool and not much else.

Economy:

Basic duration and efficiency mods are all you really need on top of energize.

Survivability:

You're invisible and you have your operator and shield gating in case of stray shots. You don't need anything else.

Subsumes:

What to replace?
Navigator is the easy answer. Outside dedicated builds the skill is entirely too slow to see use. Although the damage increase it provides is massive it's slow and unreliable in practice.

Eclipse: Eclipse is just too perfect on this build for anything else to be considered. It provides a completely separate damage multiplier which, although usually unreliable can be locked in to its highest settings constantly and reliably. Eclipse reads damage off of your frames mesh light level. When going invisible the frames mesh light level is LOCKED to whatever it was when you went invisible. Meaning as long as you cast your invisibility in a highly-light area you'll have a constant, massive boost to your damage.
Others: I don't know... roar? Everything else just pales in comparison.

Gameplay:

Start off the mission by hitting an enemy to proc [Growing Power] and casting your 4. Kill enemies until they drop an energy orb, find a bright spot of the map and cast your invisibility there. Find another energy orb and hit an enemy then recast your bow. After all that's done start mass murdering.
Use your arcane lockdown or the alt fire of the bow with the sleep arrow selected to stun enemies or simply shoot still standing ones.

Notes:

[Artemis Bow] only consumes energy when shooting so take your time and make the shots count if you're low on energy.
Remember that [Ivara]'s invisibility drains extra energy when moving. Abuse operator dashes for movement whenever applicable especially if you have lockdown which is a perfect opener for bow headshots.

Q&A:

Q0: What should I build on her bow?
A0: Here is a full build for her bow.