Clear the full H17-1 through H17-4 challenge sequence as permanent Episode 17 progression.
Global English server only; CN and JP schedules and event order differ
WHERE & HOW TO FARM
Where to farm
Main Theme → Episode 17 → Extreme Mode stage list.
Episode 17 includes four Extreme Mode stages, H17-1 through H17-4. Treat them as a sequential challenge set: unlock the mode, clear the available stage, then check the map for the next one. These stages are for chapter challenge progression, not a repeatable material route. Use each stage’s enemy preview and map to plan your squad, and use Practice Plans to test a deployment before committing to a clear attempt. Episode 17 progress persists after the temporary access promotion ends, so an incomplete Extreme set can be resumed when you regain access.
Episode 17 access and the relevant preceding chapter progression.
Extreme Mode available in the Episode 17 interface.
A squad suited to the displayed enemies and enough Practice Plans to rehearse difficult stages.
Open Episode 17 and select its Extreme Mode tab when it is available.
Choose the earliest unlocked H17 stage and inspect its enemy preview and map before entering.
Use a Practice Plan to test an opening and deployment positions if the map presents unfamiliar pressure.
Complete the stage’s displayed clear condition, then claim the result shown by the game.
Return to the Extreme Mode list and select the next stage once it becomes available.
Continue in order through H17-1, H17-2, H17-3, and H17-4, checking each map separately before attempting it.
After clearing H17-4, review the stage list and any displayed completion objectives to confirm the set is finished.
Farming tips
Plan for the stage shown on screen; a deployment that worked on one H17 map may not suit the next map’s enemies or layout.
Use Practice Plans to refine placement before a live attempt, and check the stage interface for available completion objectives.
Repeat, collect and use
The four-stage set is progression content, not a repeatable resource farm. Replay a cleared stage only if you still need a displayed objective or want to practice.
Common mistakes
Assuming H17-1 through H17-4 are available at once; clear in order and check the list for the next unlock.
Treating Extreme Mode as a material grind; use the stage reward preview and target it for challenge progression.
Repeating completed stages without a remaining objective; verify the completion state before spending further attempts.
When to stop or switch
Stop after H17-4 is cleared and the interface shows no remaining Extreme stage or objective you want to complete. Resume later if access or squad readiness is the limiting factor.
