The Sentry and the Void are solidified thought constructs. They can't die because they aren't truly alive. This was something that Owen noticed when he fought the Sentry. This is also why the Sentry can come back from what appeared to be his total destruction. If you have doubts, just go back and read the books that he's in. If Bob believes that nothing can hurt the Sentry, the Sentry construct will overcome it. This particular Sentry was above pain and death.
Flew Thor to another galaxy so fast that Thors body almost came apart, telekinesis with parts from a spaceship or something and stopping Thors hammer mid flight, created sand giants, ripped his own face off for the hell of hit, reformed instantly after Thor bashed his skull in with a hammer hit to the back of the head, matched or exceeded the strength of every earth bound hero combined and amped with Hulks gamma radiation.
The Sentry has always been a figment of Robert's imagination. You begin to understand this when you take it from the psychological perspective of a fictionalized character with Robert's physical condition. He has schizophrenia, which results from either being born with a damaged amygdala (Limbic system disorder), or having it damaged by a severe blow to the head. In real life, people without super powers that enable them to bend reality like in Robert's case, have days that they believe things are happening that a normal person without this condition can see past. In Robert's case he can't, and thus his imagination becomes reality. The Void, and the Sentry are examples of this.
That’s just a load of absolute nonsense. Whatever way you want to look at it the worm overpowered him/bfr’d. Your imaginary version of the Sentrt means nothing to me.
In that case that same worm is more powerful than all of the heroes on 616 Earth amped on gamma radiation, and capable of halting world destructive forces. I'll let you think about that for a while, and if your judgement on it doesn't change, then we can agree to disagree brother. Just remember that Robert Reynolds made everyone in creation forget that the Sentry and the Void ever existed.