Tony Stark Heart IronMan Arc Reactor CREATED BY SAURAV GARPAWAR@3DKRON YOUTUBE INSTAGRAM ABOUT -The Arc Reactor was a fusion type power source featuring a palladium core, and was the initial power source of the first Iron Man suits, and was later modified to an advanced level by Tony Stark to power his more advanced suits, as it kept on improving. ... It is unknown what happened to the reactor after this event.