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Main story · Defeat the Hedron

Fight to the Core

Unknown · Main story #12Fight the Hedron

The Hedron3-phase boss

Fight to the Core starts in the Unknown with one objective: fight the Hedron. The fight runs through three arenas. You mostly damage the boss by killing the enemies linked to it, then finish each phase with a core interaction. An empty health bar is not the end of a phase.

Prepare for the fightJump to my phase
  • Unknown
  • 3 boss phases
  • The Hedron
Fight state

This is not the final quest. Fight to the Core hands off to The End as soon as the Hedron's physical form is broken.

  1. フェーズ 1 — 最初のアリーナ
  2. フェーズ 2 — 分断されたアリーナ
  3. フェーズ 3 — 重装ウェーブのアリーナ
Quest at a glance
Previous
Rebuild
Starts
Unknown
Objective
Fight the Hedron
Boss
The Hedron
Phases
3
Direct damage
Mostly indirect, through linked enemies
Traversal
Reach / Gravity Well / arena switching
Core breaches
3
Next quest
The End
Before you enter

Before you enter

The boss is almost the whole quest. Check these before you drop in.

Traversal
Reach — required in Phase 2
Damage
Do not rely on Raw damage alone
Recommended
Upgraded weapon · reliable healing · a secondary attack
Story
Rebuild complete

There is no minimum level listed here. Check build readiness instead of an invented level gate.

Ready for the Hedron?

Tick what you already have.

Review my build

Use the Build Planner to match your current abilities to Hedron damage. There is no single best build for this fight.

What am I supposed to attack?

Attack the enemies, not the distant body.

For most of the fight you damage the Hedron indirectly. Killing the enemies linked to it drains its health bar, while hitting the central body barely moves it.

Attack these
The Hedronlinked healthLinked enemiesAttack these
  1. Enemy defeated
  2. Hedron health decreases
  3. Health bar empty → breach the core
Damage check

Mostly using basic Raw attacks? Consider switching.

Better options

  • Secondary attack
  • Fire
  • Mold
  • Effective abilities

Need the full fight breakdown?

Full boss guide

Reach the Hedron

Head northwest through the Unknown toward the western Hedron, then drop into the arena.

Reach the Hedron
  1. Start in the Unknown after Rebuild
  2. Head for the northwest Gravity Well
  3. Traverse toward the western Hedron
  4. Drop into the boss arena
Entering the arena

The fight starts after you drop in. Prepare before committing.

This is a heads-up, not a point of no return.

Some guides call this area Red Sand Island. Until the official map name is confirmed, follow the northwest route toward the western Hedron.

Boss phase tracker

Three phases. Mark each one when you finish its core breach, not when the health bar empties.

Phase 1 of 3
0 / 3 phases0 / 3
  1. Reach the Hedron
  2. フェーズ 1 — 最初のアリーナActive
  3. フェーズ 2 — 分断されたアリーナLocked
  4. フェーズ 3 — 重装ウェーブのアリーナLocked
  5. Quest complete

Tick phases manually. This page never guesses that you finished a phase.

Core breach

Every phase ends the same way. An empty health bar is only step one.

  1. Drain the boss health bar
  2. Reach the Hedron centre
  3. Finish the outer core
  4. Enter the inner core
  5. Complete the core interaction
Health bar empty but nothing happens?

The phase is not finished yet. Go to the Hedron centre, perform the finishing interaction and complete the core sequence. The same loop repeats in all three phases.

フェーズ 1 — 最初のアリーナ

チュートリアル的なフェーズ。中央の足場に来るリンクした敵で最初の体力バーを削ります。

Active
Goal

最初の体力バーを削り切り、コアをブリーチ

  1. 飛び道具の連射を回避する
  2. 足場のリンクした敵を処理する
  3. 続いて出現する重装の敵を倒す
  4. The Hedron の体力バーを 0 にする
  5. コア操作を完了する
Arena
単一の中央足場、奥に The Hedron
Hedron attack
アリーナ端からの飛び道具の連射
Your target
中央足場のリンクした敵
Later in the phase
体力バーに寄与する重装の敵
If you are stuck

体力バーが止まったなら、敵が残っています。重装の敵も体力バーに寄与します。

Phase 1 loop
  1. Enemy defeated
  2. Hedron health decreases
  3. Health bar empty → breach the core
Core breach
Drain the boss health barReach the Hedron centreFinish the outer coreEnter the inner coreComplete the core interaction
Health bar empty but nothing happens?

フェーズ 2 — 分断されたアリーナ

地面のレーザーと 2 つの戦闘足場。リンクした敵の半分は反対側にいます。

Goal

両方の足場を片付け、コアをブリーチ

  1. 動き続けて地面レーザーを避ける
  2. Arena A のリンクした敵を処理する
  3. Reach で Arena B へ渡る
  4. 残りのリンクした敵を処理する
  5. 体力バーを削り、コアをブリーチ
Arena
つながった 2 つの戦闘足場
Hedron attack
近くを掃く地面レーザー
Your target
リンクした敵
If you are stuck

ボスの体力が半分あたりで止まるなら、残りの敵は 2 つ目の足場にいます。

Traversal

ここでは Reach が必須です。メインストーリーで取得済みなので、詰まることはありません。

ボスの体力が半分あたりで止まった？Reach

アリーナの反対側を見てください。残りのリンクした敵は 2 つ目の戦闘足場にいます。Reach で渡りましょう。

The other half is across the gap
Arena AReachArena B
Enemies keep moving

Hit a moving enemy once to interrupt it, then commit your damage before it starts moving again.

Core breach
Drain the boss health barReach the Hedron centreFinish the outer coreEnter the inner coreComplete the core interaction
Health bar empty but nothing happens?

フェーズ 3 — 重装ウェーブのアリーナ

2 つの側と 2 つの重装ウェーブ。ダメージのほとんどは重装の敵から入ります。

Goal

2 つの重装ウェーブを片付け、最後のコアをブリーチ

  1. 重装ウェーブ 1 を処理する
  2. 次のウェーブが反対側に出たら Shift で移動する
  3. 重装ウェーブ 2 を処理する
  4. 残りのリンクした敵を片付ける
  5. 体力バーを削り、コアをブリーチ
Arena
両側に分かれたアリーナ
Hedron attack
重装ウェーブ出現中の広範囲の圧力
Your target
重装の敵
If you are stuck

敵が届かない位置に見えるなら、反対側にいます。ジャンプの失敗ではありません。

敵が反対側にいる？Gravity Well / Shift

アリーナ端の Gravity Well を使い、Shift で反対側へ移って重装ウェーブを続けます。

Boss phase tracker
  • Heavy Wave 1
  • Heavy Wave 2
  • Final linked enemies
  • Final core breach
Switch sides with the Gravity Well
Side AGravity Well / ShiftSide B
Core breach
Drain the boss health barReach the Hedron centreFinish the outer coreEnter the inner coreComplete the core interaction
Health bar empty but nothing happens?
Fight to the Core complete

Fight in progress

Fight to the Core is not the final quest. As soon as the last core interaction ends, the story continues into The End. There is no return-to-hub step.

0 / 3 phases

The story continues

Fight to the Core is not the final quest. As soon as the last core interaction ends, the story continues into The End. There is no return-to-hub step.

Next main quest

The End

Continue to The End

Need the full fight breakdown?

Three phases · damage rules · attacks

Full boss guide

Rewards

The published reward list mixes quest completion, boss drops and trophies, so it stays unverified here.

  • Living Shard

    Living Shard

  • Reset Item

    Reset Item

  • Artifact candidate

    Untapped Worn Eraser

  • Trophy

    Repeating, Refracting

  • Additional candidate

    Graffiti Artist · Source reward

What is a quest reward, a boss drop or a trophy unlock is still being verified.

Fight to the Core troubleshooter

What's happening?

  • I can't find the Hedron

    Head northwest through the Unknown toward the western Hedron and drop into the arena. If you are still in Rebuild, finish that memory sequence first.

  • I'm not sure I'm ready for the fight

    Check damage coverage and survivability, not a level number. Bring an effective non-Raw option and reliable healing before you drop in.

  • My attacks do almost no damage

    The Hedron mostly takes damage through the enemies linked to it. Attacking the central body barely moves the bar. Switch to secondary, Fire, Mold or effective abilities.

  • The Hedron health bar isn't moving

    You are probably attacking the central body. Kill the linked enemies and the heavy enemies instead; their deaths drain the boss health bar.

  • I don't know what to attack

    Attack the enemies connected to the Hedron. Each kill lowers the boss health. Only the core interaction at the end targets the centre.

  • Phase 1 won't end

    Clear the linked enemies and the heavy enemies until the first health bar is empty, then reach the centre and finish the core interaction.

  • Phase 2 stopped around half health

    The remaining linked enemies are on the second combat platform. Look across the arena and cross with Reach.

  • I can't cross to the other arena

    Use a Reach point to cross to Arena B in Phase 2. Reach is required here and is already unlocked in the main story.

  • The enemies keep moving

    Hit a moving enemy once to interrupt it, then commit your damage before it starts moving again.

  • Phase 3 enemies are on the other side

    You are on the wrong side of the arena. Use the Gravity Well on the arena edge, then Shift across and continue the heavy wave.

  • I can't reach the heavy enemies

    Do not try to jump the gap. The intended route is the edge Gravity Well plus Shift, which switches you to the opposite side.

  • The health bar is empty but nothing happens

    The phase is not finished. Go to the Hedron centre, perform the finishing interaction and complete the core sequence.

  • I don't know how to enter the core

    Finish the outer core at the centre, then enter the inner core and complete the core interaction. This repeats every phase.

  • I finished Phase 3 but the story isn't over

    Correct — Fight to the Core is not the final quest. The story continues immediately into The End. There is no return-to-hub step.

None of these? Open the Quest Troubleshooter
Stuck in the fight?

Stuck in the fight?

Tell the assistant which phase you are in and what is happening. It knows the linked-enemy rule, the Phase 2 Reach crossover and the Phase 3 Gravity Well switch.

Ask about this quest

Where this page sits

This quest page owns the final-fight readiness check, the damage explainer, the three-phase tracker and the core-breach guard. Full Hedron mechanics belong to the boss entity, and the route belongs to the Unknown location page.

Browse all questsOpen the progression walkthrough