Hello there,

Introduction:

[Mesa] (Prime) is all about Wild Wild West. She shoots stuff. She's good at shooting stuff. Actually, this is the only thing she's good at.

Playstyle:

tl;dr
Jump and shoot, until it's done.
Try to always have skills 1, 2, and 3 active.

Attributes & Abilities:

In this build, I replace her "useless" Ballistic Battery with much more useful Nourish. This ability can multiply your Energy gain, from a single Orb, add Viral damage to your weapons, including [Regulators], Stagger enemies and make them suffer from Viral splashes.

Shooting Gallery provides jamming weapons and increases my damage. This power shifts between team members.

Shatter Shield provides energy barrier that gives me 95% damage reduction from bullets, this is important, I'm still vulnerable to any melee attacks, splash, cloud, AoE damage.

Peacemaker, the bread and butter in this build. This skill makes you feel like you have an aim bot in the game for the duration, which is actually true.

This build is pretty much balanced in any way. High Strength, mainly to buff your damage. Max Duration, because all skills are based on Duration and her ultimate is also based on Duration/Efficiency. Why so much protection, you might ask? Let's be honest, [Mesa] is a glass cannon, she deals a lot of damage, but two bullets are enough to put her down. That's why she needs a lot of crowd control.

Aura Slot:

Suggested Aura Forma, so that it can be changed, when needed.

• Combat Discipline - Allies gain Health on kill. Aura bearer loses Health on kill.
  WARNING: this Aura can kill bearer.
• Growing Power - Increases Ability Strength after Status proc.
• Corrosive Projection - Reduces enemy armor.
• Brief Respite - Grants Shields equal to a % of Energy spent while Overshields are inactive.
• Enemy Radar - Pinpoints enemy locations on mini-map.
• Energy Siphon - Provides constant Energy regeneration.

Exilus Slot:

Must be unlocked with an Exilus Adapter.

• NONE - if you don't feel it, or really need it, then there is no point in unlocking the slot.
• Cunning Drift - Increases slide, reduces friction and increases Ability Range.
• Handspring - Speeds up a Warframe's knock-down recovery rate.
• Sure Footed - Increases a Warframe's chance to resist knockdown.
  Primed Sure Footed is exclusive to the Daily Tribute system. It will become available at first at day 400. TAKE IT!!!
• Vigilante Pursuit - Displays all enemies within its radius with red markers on the mini-map.

Warframe Arcane Enhancements:

• Arcane Avenger - On Damaged, 21% chance for +45% Critical Chance for 12s.
• Arcane Velocity - On Critical Hit, 90% chance for +120% Fire Rate to Pistols for 9s.

Archon Shards:

• Crimson Archon Shards (RED):

+25% (+37.5%) Secondary Critical Chance <- GO ALL RED!

Focus School:

• Zenurik:
  Energy Pulse - Energy pickups grant 50 % additional energy over 5s.
  Wellspring - First Ability creates a well of energy for 8s. Allies passing through the well gain 5 Energy/s for 30s. Use your first Ability inside a Wellspring to increase its size, boost its duration by 20s, and grant 20% Ability Strength to those inside.
  Temporal Drag - Second Ability emits a radial burst, slowing any enemy it touches by 80% for 10s.

Helminth Subsumable Abilities:

• Nourish - Crowd Control, Damage Buff, Energy Restore

Loadout:

• Weapons - Primary: The Iron Break Rauta, Secondary: any good primer, like: Intravenous Cannula - IMPORTANT! - change Arcane, add Secondary Outburst, Melee: use Rivenless StatStick for Atlas (Prime).
• Peacemaker - [Mesa]'s Regulator Pistols Build.
• Companion - Adarza Kavat - Red Crit Eye

Summary:

[Mesa], a cowgirl, at least that what people see, when they play as her. She is an S tier choice for fast missions, where killing things shortens the duration of the mission or waiting for the next wave of enemies. Is she a good, solid choice for long endurance runs? Yes, but be aware that she's a glass cannon.

Enjoy!
THeMooN85