Xaku
Xaku builds
The Lost Cycle
Endgame4 FormaEndgameMedium confidenceSteel PathHelminthShards optional

XakuThe Lost Cycle

Endgame build. Accuse converts a pack, Gaze strips, Deny beams Void and wipes Sentient resistances. You actually use all three Lost modes. Whisper is the Helminth hole.

Codex Checked · Compared against current game data for this update. · Update 43.5 · 5 Sept 2026 · PC · Current

Mixed tiles, Sentients, people who like the kit more than the halo

Wrong drop or mechanic?

Don’t build this yet

First Bones first

This loadout sits at Endgame. It wants Forma, Helminth, or shards you may not have. Play the Starter until those systems are open — then this page is the upgrade, not the homework.

Open First Bones

Why this build?

Endgame for Mixed tiles, Sentients, people who like the kit more than the halo

Health: Not yetHelminth, Steel Path, or Archon Hunts still closed. Play the Starter.

Play this in Steel Path
  • The Lost is a kit, not a skip button. This config exists for people who like all three.
  • Xata's Whisper is the Helminth slot on serious Xaku. Grasp guns do not gain Whisper.
  • Deny without Grasp guns is a sad beam. 2 first always.

Don’t use this for: players without Helminth

Specialised investment for hard content

You don’t need the shards to run the loop. They are a later ceiling, not a gate.

Bring: Cycle disciplineThe Lost is one button, three modes. Accuse for friends, Gaze for strip, Deny for a Void beam that also scales with how many Grasp guns you stole.

Alternative if…

My test

Did this still work for you?

Your note, in this browser. Separate from Codex verification — the stamp on the card is editorial, this is yours.

Readiness

Inventory unknown

Not checked — add your collection. You have not failed a test.

  • Required mods 0/9 · required0/9 named
  • Forma 0/4 · required4 on the card. Codex does not track installed Forma.
  • Helminth 0/1 · requiredSubsume Nourish (Grendel) or Roar (Rhino)
  • Arcanes · recommended0/2 recommended
  • Shards · optionalOptional unless the card says a breakpoint

Investment: 4 Forma · Reactor · Helminth (Nourish (Grendel) or Roar (Rhino)) · 2 shards · 4 specialised mods. Typical farm ~4–6 hours. Trade if a route is vaulted.

Codex Checked · Compared against current game data for this update. · Update 43.5 · 5 Sept 2026 · PC · Current

Medium confidence. A solid recommendation with more situational dependencies. Confidence is not verification. Verification is separate: Codex Checked against Update 43.5.

Plan

Today → next → later

Inventory unknown — mark “I own this” on a few mods. Until then this is a plan, not a score of zero.

  1. TodayPlay First BonesThe Starter is the loadout you can actually take into a mission tonight.
  2. NextGet Growing PowerThe Silver Grove quest
  3. After that4 FormaOne slot at a time. Rank 30 after each polarize.
  4. LaterAmber · Casting SpeedHelminth and shards are the last rungs. They are not the Starter.
  5. FinalThe Lost CycleEndgame · Endgame · 4 Forma

Helminth & shards

What to put on the body

Nourish (Grendel) or Roar (Rhino) over Xata's Whisper (1)

Whisper is a Void damage buff for your gun. Grasp does not need it. Nourish is Viral + energy. Roar multiplies stolen-gun hits. Keep 2, 3, and 4.

Helminth is locked. Tick it on Progress before you subsume.

  • 2 Amber · Casting SpeedCycling Lost is the skill.Archon locked
  • 2 Crimson · StrengthAll three Lost modes.Archon locked

Tonight

What is actually up

30 minutes, one hour, or two — matched to this loadout, not a dump of the Origin System.

  1. 30 minutes

    Farm Growing Power

    One named gap. The Silver Grove quest

  2. 60 minutes

    Growing Power, then Forma

    Finish the missing named card, then spend a Forma if a polarity is still fighting you.

  3. 120 minutes

    Subsume Nourish (Grendel) or Roar (Rhino)

    If you are logging off after this, stop at the named component. Do not start a second Forma session tired.

Who this is for

Play this build from zero

You Helminthed Whisper and you actually want all three Lost modes.

Time to a playable copy
After Nourish or Roar over 1, plus casting speed so the cycle is not agony.
First mission to practice in
A mixed Exterminate with a Sentient or two if you can find them.

2 button drills · 14 parts · tick the lists as you go

Before you start

0 of 3 done

Put it on the Warframe

0 of 4 done

Keep this up

Lost loop

Pocket card. Stick this on a second screen; the long version is the mission below.

  1. 1Grasp (2) first — Deny cares how many guns you stole.
  2. 2Accuse (3) a clump so they fight each other.
  3. 3Gaze (3) the Eximus.
  4. 4Deny (3) the leftover or the Sentient. Untime (4) to pause everything. Nourish/Roar (1) on the timer.

First mission — press these buttons

  1. 1

    Steal guns, then Accuse a clump

    3

    They fight each other.

  2. 2

    Gaze the Eximus, Deny the leftover

    3

    Deny hits harder with a fat halo. Untime pauses the ones you want to keep.

Common mistakes

  • Deny with zero guns

    The beam is multiplied by gun count. Steal first.

When this feels easy

  1. 1Casting speed shards are not optional hereThree modes on one key. Tempo is the build.

Parts checklist

0 of 14 owned. Tap How on anything you still need.

Depends on

What this loadout needs

Required is a gate. Recommended is a ceiling. Optional is a later farm — don’t stall the card for it.

Required

  • Growing Power

    missing · The Silver Grove quest

  • Cunning Drift

    missing · Lua Halls of Ascension

  • Blind Rage

    missing · Run Orokin Vaults

  • Umbral Intensify

    missing · Finish The Sacrifice

  • Overextended

    missing · Orokin Vaults

  • Stretch

    missing · Enemy drops

  • Primed Continuity

    missing · Wait for Baro Ki'Teer

  • Primed Flow

    missing · Baro Ki'Teer

  • Rolling Guard

    missing · Arbitrations

  • Nourish

    missing · Helminth

    Whisper is a Void damage buff for your gun. Grasp does not need it. Nourish is Viral + energy. Roar multiplies stolen-gun hits. Keep 2, 3, and 4.

  • Roar (Rhino)

    missing · Own Rhino

    Whisper is a Void damage buff for your gun. Grasp does not need it. Nourish is Viral + energy. Roar multiplies stolen-gun hits. Keep 2, 3, and 4.

Recommended

  • Molt Augmented

    missing · Unlock the Zariman

    Strength for Accuse chance, Gaze strip, Deny beam.

  • Arcane Energize

    missing · Buy 20–40 Platinum worth

    You will cycle 3 a lot.

Optional

Helminth

Subsume Nourish (Grendel) or Roar (Rhino) over Xata's Whisper (1)

Whisper is a Void damage buff for your gun. Grasp does not need it. Nourish is Viral + energy. Roar multiplies stolen-gun hits. Keep 2, 3, and 4.

Strength

~220%

Duration

160%

Range

200%

Deny damage multiplies with Grasp gun count. Steal guns before you beam.

From the mods

Live power

Additive from max-rank Codex mods. Efficiency clamped 15–175%. Umbral set is +11% Strength per extra piece.

Strength
183%
Duration
155%
Range
250%
Efficiency
45%
Energy
+275%
Capacity
52 / 67

1 Umbral piece

Open slots

Weapon HUD

Arsenal numbers

Base × damage mods × crit expectation × fire rate × multishot. No faction, no quantization. Galvanized kill stacks are a slider, not assumed.

Damage
35
Crit
12% × 2.00
Status
26%
Fire rate
9.58
Multishot
1.00
Avg hit
39
Arsenal DPS
376

Toggle common mods

Xaku mods

  • AuraGrowing PowerSilver Grove
  • ExilusCunning DriftLua
  • 1Blind RageOrokin Vaults
  • 2Umbral IntensifyThe Sacrifice
  • 3OverextendedOrokin Vaults
  • 4StretchDrops
  • 5Primed ContinuityBaro
  • 6Primed FlowBaro
  • 7Rolling GuardArbitrations

Cycle discipline

The Lost is one button, three modes. Accuse for friends, Gaze for strip, Deny for a Void beam that also scales with how many Grasp guns you stole.

Arcanes

Molt Augmented

Strength for Accuse chance, Gaze strip, Deny beam.

Zariman

Arcane Energize

You will cycle 3 a lot.

Eidolon

Archon shards

  • 1Amber · Casting SpeedCycling Lost is the skill.2 · EDA
  • 2Crimson · StrengthAll three Lost modes.2 · Netracells
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