The First Descendant Season 4 Story Requirements and Rewards

AT A GLANCE

The exact story prerequisite before Karel's Mothership opens.

S04 EP01 becomes available after every main quest from Pre-Season through S03 EP04 is complete. Skipping an earlier episode blocks the Season 4 line even if the account's power is high enough for later content.

Required sequence

1. 01Pre-SeasonComplete main quests
2. 02Seasons 1–2Complete every main quest
3. 03Season 3Finish through S03 EP04
4. 04S04 EP01Accept and complete the chain
5. 05And, TomorrowNormal Karel's Mothership entry condition

Pre-Season→Seasons 1–2Seasons 1–2→Season 3Season 3→S04 EP01S04 EP01→And, Tomorrow

Read the route as text

1. Pre-SeasonComplete main quests
2. Seasons 1–2Complete every main quest
3. Season 3Finish through S03 EP04
4. S04 EP01Accept and complete the chain
5. And, TomorrowNormal Karel's Mothership entry condition

1. Complete the Pre-Season main quests.
2. Continue through every Season 1 and Season 2 main quest.
3. Complete all Season 3 episodes through S03 EP04.
4. Accept and complete the S04 EP01 main quest chain.
5. Finish And, Tomorrow to meet the stated Normal-difficulty entry condition for Karel's Mothership.

Official S04 EP01 rewards

Completing the episode grants:

• a special chest attachment;
• an Ultimate Alignment Device.

Those are episode-completion rewards. Karel's Mothership, Raven research, Trials, and the Conquest event have separate unlocks and reward tables.

Update 1.4.0 also changed the opening Esiemo exclusive quest: A Mission for Esiemo now starts by checking the Unofficial Operation Records Terminal instead of talking to Enzo. That is unrelated to the S04 EP01 prerequisite but can explain an old quest guide mismatch.

Hotfix 1.4.3c fixes a separate blocker that prevented the Hailey Descendant-exclusive quest from progressing. Update and reconnect before applying an older workaround. This fix does not change the Pre-Season-through-S03-EP04 requirement for starting S04 EP01.

What completion does and does not unlock

Finishing S04 EP01 establishes the story side of the Season 4 progression and grants the two listed episode rewards. It does not automatically research Raven, satisfy a public Hard-mode Arche Activity gate, or complete the first Normal Karel's Mothership clear. Those are separate unlock contracts.

Sources & evidenceOpen the references used for this page

• The First Descendant Update 1.4.0
• Season 4 Episode 1 official page
• Patch 1.4.2
• Hotfix 1.4.3c