Theorylytics

The Lost

Used by Xaku

Ability3
Energy25

The Lost

Cycle through a trio of lost Warframe powers. Accuse manifests a Void fissure to corrupt enemies into allies. Gaze grasps targets in Void tendrils that capture damage and inflict it when the target is released. Deny annihilates with a beam of Void energy, wiping Sentient resistances.

Introduced in Update 29.0 (2020-08-25)

Ability stats

Strength
  • See in-game / wiki ability card for rank values
Duration
  • See in-game / wiki ability card for rank values
Range
  • See in-game / wiki ability card for rank values
Misc
  • Cycle through a trio of lost Warframe powers.

Info

  • The Lost is Xaku’s ability 3.
  • Cycle through a trio of lost Warframe powers.
  • Use it with the rest of the kit — especially Xata's Whisper, Grasp Of Lohk — instead of casting it in isolation.
  • Ability Strength, Duration, Range, and Efficiency each matter differently; check Mod Scaling below before dumping all four.

Augment

9

The Relentless Lost

The Lost Augment: The Lost gains 35% Ability Strength and 15% Ability Efficiency when cast. The effect stacks up to 3x. Casting the same…

Xaku
Open augment →
The Relentless Lost

The Lost Augment: The Lost gains 35% Ability Strength and 15% Ability Efficiency when cast. The effect stacks up to 3x. Casting the same ability back-to-back resets the effect.

Max rank drain ~9; see rank table on the augment page.

Open full augment page →

Cast Changes

  1. Modifies The Lost with: The Lost Augment: The Lost gains 35% Ability Strength and 15% Ability Efficiency when cast.
  2. Rank up the augment to unlock the full effect values.
  3. Costs a mod slot (and capacity) — only equip it when the change matters for your loop.

Worth the Slot?

  1. Worth it when the augment’s change is central to how you play Xaku.
  2. Skip it if the base The Lost already does what you need and you’d rather keep the slot for survivability or strength.

Tips & Tricks

  • Read the battlefield first — cast The Lost when it actually solves the room, not on cooldown habit.
  • Pair The Lost with movement and energy economy so you’re not stranded after a big spend.
  • On Steel Path, confirm whether The Lost still carries without strip, Viral, or a squad buff.
  • If you never press 3, it’s the first Helminth candidate on Xaku.

Ability dossier · The Lost

Verified 2026-07-22

Synergies

  • The LostXata's Whisper

    Use The Lost to set up Xata's Whisper, or follow Xata's Whisper with The Lost while enemies are vulnerable.

  • The LostGrasp Of Lohk

    Use The Lost to set up Grasp Of Lohk, or follow Grasp Of Lohk with The Lost while enemies are vulnerable.

  • The LostThe Vast Untime

    Use The Lost to set up The Vast Untime, or follow The Vast Untime with The Lost while enemies are vulnerable.

Mod Scaling

Strength

Improves The Lost’s damage or effect potency where Strength is listed on the ability.

Duration

Duration is low priority on The Lost unless an augment or lingering effect needs it.

Range

Range is usually dumpable on The Lost unless you feel the hitbox is too tight.

Efficiency

The Lost costs energy each cast — Efficiency (or strong regen) keeps the loop comfortable on long missions.

Priority

Stack the stats that actually move this ability’s needle, then Efficiency for uptime.

Mission Use Cases

MissionHow to Use It
Steel Path Survival / Defense / DisruptionTest whether The Lost still clears or enables clear when enemies are dense and overlevelled.
Mobile Defense / ExcavationUse The Lost to control or delete the swarm on the objective, then reposition.
Exterminate / Capture Speed RunsCast The Lost only when it saves time — skip it on empty tiles.
Spy / Rescue / Quiet RoutesIf The Lost is loud or forces combat, save it for after the vault; if it’s stealth-friendly, use it to stay safe.

Comparisons

  • VS

    Vs similar tools on other frames — The Lost is tuned for Xaku’s loop — don’t judge it as a standalone subsume without the rest of the kit.

Other Xaku abilities