This final part takes you from Drax's Promise to Magus. The complete Guardians of the Galaxy guide provides access to the first two parts and the specialized guides.

Chapter 11 — The Mind's Strength
Objective: enter Drax's Promise and help him accept the loss of his family.
- Follow Adam Warlock through the labyrinth and destroy the sources of the shadow creatures.
- Thanos's manifestations are not a traditional boss fight: continue until the story sequence is triggered.
- The final responses change a few lines of dialogue, but not how the following chapters play out.
Chapter 12 — Nowhere to Go
Objective: cross occupied Knowhere, free Cosmo and reach the Continuum Cortex.
- Use the abilities of all four Guardians in succession to open the passages.
- To free Cosmo: reach out, bring him back to the present, then remind him of his puppies.
- Success avoids an additional illusion and triggers his help in chapter 14.
Chapter 13 — A Little Chance
Objective: explore Maklu IV, obtain the plasma shot and capture Fin Fang Foom to convince Lady Hellbender to help the Guardians.
- Plasma melts ice and neutralizes dangerous plants.
- Against Fin Fang Foom, first remove the ice armor from his limbs and chest.
- During openings, use every available ability, then move away from the red zones.
Chapter 14 — Head on the Line
Objective: attack the Sacrosanct and advance to the heart of the ship.
- Worldmind and Cosmo each eliminate a large wave if you convinced them to help.
- Use the wind shot in the fan room and plasma on the frozen obstacles.
- Check the branching paths before the large arenas: the final three hidden outfits are there.
Chapter 15 — Broken Promises
Objective: free Nikki from the Promise, then defeat Grand Unifier Raker.
- In the apartment, complete the requested actions before helping Nikki reject the illusion.
- Stun the Unifiers before engaging Raker.
- Raker's yellow shield has no elemental weakness: keep up the pressure and save your powerful abilities for when he falls.
Chapter 16 — Magus
Objective: provoke Magus, survive the waves, then complete the final sequence.
- Choose Slowly Clap, Harass Him, then Provoke Magus.
- Get under Nikki's protection before the impacts and quickly eliminate the secondary enemies.
- The final QTE concludes the fight; there is no lengthy traditional health bar.
FAQ
Is Fin Fang Foom the final boss?
No. Fin Fang Foom is fought in chapter 13; Raker and then Magus occupy the final two chapters.
How do you convince Cosmo?
Choose Reach Out, Focus on the Present, then Talk About the Puppies. Cosmo will help you in chapter 14.
How do you defeat Magus?
Provoke him with Slowly Clap, Harass Him, then Provoke Magus, survive the waves and complete the final QTE.