Introduction
Delta Force S10 'Nuclear Fission' season is here, and this time it is different. Unlike previous seasons where 3x3 missions were pure kill-grinds, S10 brings a genuine narrative-driven experience — the ultimate mission 'Phase Transition.' In this mission, you will face a standoff between two brothers, Nasir and Monchir, and personally decide the fate of the AZ3 Nuclear Power Plant.
Bilibili creator 'Xiao Pu - Delta Rebirth Edition' (2.53M+ views, ranked #70 on the site-wide leaderboard) [Confirmed] has published a comprehensive video showing both ending cinematics and the full gameplay process. This guide synthesizes that video with written guides from the Chinese gaming community to give you the most complete dual-ending breakdown available in English.
1.Prerequisites: How to Unlock 'Phase Transition'
Unlock Condition: Complete all preceding S10 3x3 mainline missions and accumulate the required star count to unlock 'Phase Transition.' Enter AZ3 Nuclear Plant on Confidential Operations mode (story does NOT trigger on Normal mode). Within 10 seconds of spawning, the mysterious caller Monchir will contact you and initiate the story sequence.
i. Required Mode：AZ3 Nuclear Plant - Confidential Operations only. Normal mode has no interaction points and will not trigger the storyline.
ii. Single-Raid Reset Rule：ALL steps of 'Phase Transition' must be completed within a single raid AND you must extract successfully. If you die, lose items, or fail to extract, ALL progress resets — you must restart from scratch. This is the most punishing single-raid binding design in S10.
⚠️ Critical Reminder：The two endings grant two different badges and achievements. One account can only earn ONE of them! Choose carefully — there is no going back.
2.Core Flow: From Cooling Pipes to Elevator Showdown
After meeting prerequisites, the mission has four fixed steps. The first three are shared between both endings; the branch happens at step four during the elevator cinematic.
i. Fix Cooling Pipes：Land near the Emergency Thermal Power Station (marked green on map). Interact with 3 ruptured pipes (QTE mini-game). Caution: this area sees heavy AI + player skirmishes — do not linger.
ii. Collect Octopus Programs：Three fixed spawn locations: ① beside the vending machine south of Reactor #2, ② second-floor shelf in the Main Turbine Hall, ③ on top of the crate at the north exit of Warehouse A1 (under a tree). [Supplemental] Recommend teammates split up to collect. Solo route: Turbine Hall → Vending Machine → A1. Keep anti-radiation meds active in radiation zones.
iii. Upload at Control Room：Bring the programs to the top-floor control room computer in the core area and interact to upload. Triggers ~6 minutes of story dialogue and cinematics. [Confirmed] You cannot move during upload. The top floor is a prime ambush spot — teammates should hold the stairway.
iv. Elevator Showdown — The Branch Point：After upload, exit through the white door into the elevator hall. Cinematic triggers: brother standoff — Nasir (elder brother) on the LEFT, Monchir (younger brother) on the RIGHT. You can only kill ONE of them. The survivor dictates the rest of the mission. This is the sole branching point for the dual endings.
3.Ending A: Fusion Future — Repair the Plant (Order Path)
Choice: In the elevator cinematic, kill Monchir on the RIGHT side. Nasir survives.
i. Follow-Up Actions：After the cinematic, Nasir authorizes a power increase — but you must manually shut down 5 nuclear control console red STOP buttons (Morse code input required, marked red on minimap). Locations: Reactor Building floors 1 & 2, Stellarator, and the peripheral machine room. Split the team for efficiency. [Confirmed] Do NOT accept the 'Emergency Scram' beacon mission — it will forcibly trigger the explosion ending. Once all STOP consoles are shut, reactor power returns to zero — the plant is safe.
ii. Rewards：Badge: 'Fusion Future.' Achievement: 'Dawn of Asara.' After completion, core area safes can be freely looted with no AI attacks.
Story Assessment: The 'order' path leans into technological expansion with a 'Dark Star' foreshadowing, hinting at deeper implications for G.T.I.'s future operations.
💡 Pro Tip：Try Fusion Future first — lower difficulty, and free post-mission looting of the core area makes it the better value option.
4.Ending B: Fission Rebirth — Destroy the Plant (Chaos Path)
Choice: In the elevator cinematic, kill Nasir on the LEFT side. Monchir survives.
i. Follow-Up Actions：After the cinematic, Monchir implants a virus. About 10 minutes later, a blue exclamation mark 'Emergency Scram' beacon appears at the Reactor Building second-floor control room. Accept the mission and proceed: clear 3 Havk soldiers → escort Dr. Monchir to the main control room and defend for 30 seconds against multiple AI waves → insert the AZ3 key to initiate the scram sequence. This is an intense combat segment — the entire team must hold doorways and rotate cover.
ii. Rewards：Badge: 'Fission Rebirth.' Achievement: 'Rebirth from Ashes.' [Supplemental] This ending has significantly higher combat intensity than Fusion Future, but the narrative impact is stronger — the plant explosion cinematic is one of S10's most visually stunning moments.
Story Assessment: The 'chaos' path embodies a fierce 'born from destruction' philosophy with a tragic, cathartic tone. Players who choose this ending consistently report a more thrilling combat experience.
⚠️ Caution：Fission Rebirth has heavy AI wave attacks. Bring at least Level 5 armor and ample ammo. Solo queue players MUST communicate the ending choice with teammates beforehand — disagreements during the elevator cinematic can wipe the entire squad.
5.Quick Comparison: Dual Endings at a Glance
Fusion Future vs Fission Rebirth — core differences in one view:
Choice: Fusion: Kill Monchir (RIGHT) | Fission: Kill Nasir (LEFT)
Follow-Up: Fusion: Shut down 5 STOP consoles | Fission: Escort doctor + defend against AI waves
Combat Intensity: Fusion: Low (manual shutdown, no AI siege) | Fission: High (multi-wave AI, full-team defense)
Atmosphere: Fusion: Order, tech expansion, Dark Star foreshadow | Fission: Chaos, rebirth from ashes, cathartic destruction
Badge: Fusion: Fusion Future | Fission: Fission Rebirth
Achievement: Fusion: Dawn of Asara | Fission: Rebirth from Ashes
Conclusions
S10 'Nuclear Fission's 'Phase Transition' mission is arguably the finest season mission design in Delta Force history. It breaks free from the 'grind kills + run to points' formula and places genuine narrative agency in the player's hands. Repair or destroy? Order or rebirth? There is no correct answer — only your own conviction.
But remember: two badges, two achievements, one account can only claim one. Fusion Future offers steadier gameplay; Fission Rebirth delivers a more intense battle — choose what you love, then commit fully to finishing that single raid.
How to Use This Guide with DFT & BuffBuff
1. Open Delta Force Tools and go to the Weapon Builds section.
2. Search for RM277 or SVTH loadout codes and import them directly into your armory.
3. Fine-tune recoil, optics, and ammo to your preference, then save the build.
4. Top-Up Smartly (Optional): When you need attachments or consumables fast, BuffBuff provides official top-ups with timed discounts. Upgrade, test again, and lock your final loadout.
Master the RM277 for ranged suppression and unlock the SVCH's full-auto close-range backup, and you'll be ready for the entire "Fission" season. Good hunting, operators.
