Despite seemingly having to win over the fight for the Nano Gauntlet, nothing happened when Thanos snapped his fingers. Once Thanos looked over to Stark, he revealed to Thanos that he had transferred all six Infinity Stones to his Iron Man Armor, much to Thanos' horror of this discovery.
Stark bonded all six Infinity Stones onto the knuckles of his hand and felt the energy surging onto his body. Once he had all of the Stones at his disposal, Tony looked over to Thanos again and replied to him by saying that he was Iron Man before taking a long deep breath. After that was settled, Iron Man snapped his fingers in front of Thanos, as he watched all of his surrounding troops and armies turned into dust and, accepting his inevitable defeat, sat down and crumbled into ash.
Since he was merely mortal from wielding the powers of the universe, the devastating force of the snap charred the right side of Tony's face and body. Tony collapsed among the debris of the New Avengers Facility. The physical toll from the Gamma Radiation and the raw energy from the Infinity Stones, was too much for him to endure. Rhodey met up with Tony and discovered that he was seriously injured from the Stones before Spider-Man had came along.
Peter tried to contact Tony while he was slowly resting and began to feel pain. After being told that they won the battle, Parker was taken away by Rhodes, leading Pepper Potts to try to contact him. Stark uttered Potts' name in a greeting, having her to ask F.R.I.D.A.Y. to check his heart. Pepper told Tony that he could rest now, as he began to smile at her face before he died. Holding Pepper's hand, Tony looked over to his right, leaving his Arc Reactor to lose its power.
Once the Iron Man Armor was now turned off, Tony Stark died in peace with his sacrifice, surrounded by Pepper Potts, War Machine, and Spider-Man, with Thor and Captain America looking onward, all devastated and honored by Stark's selfless act to save the universe. Upon seeing this, the Avengers, Guardians of the Galaxy, and Captain Marvel, took a knee to honor the legacy of Stark and his righteous sacrifice.
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The Story of Tony Stark/Iron Man (Marvel Cinematic Universe)
ActionThis story tells the entire life of Tony Stark in the Marvel Cinematic Universe and how he became Iron Man and joined the Avengers and became their leader alongside Captain America. My 2nd favourite MCU superhero and Avenger.