Surived being thrown head first into a stone wall, by a blast of energy that destroyed hundreds of tons of rock.
Had a bomb explode in the same room as him (with no cover). Not a scratch or singe could be found on his cloak or body.
Skill
One aspect of D's fighting is his unholy skill.
D's sword can cause wounds that even a regeneration strong enough to repel bullets can't easily heal.
In the 9th novel he cuts down holograms. Conglomerations of electrons completely unaffected by normal attacks, but capable of dealing physical harm with their weapons, were cut down by D.
One technique involves catching an opponent's thrusting blade, and through some secret art, stopping any movement the opponent might attempt at that point.Then throwing the captured opponent and the blade with bone-crushing force.
D can direct his wooden needles with insane accuracy and skill. He was able to attack an airborne figure from a vertical angle with a rebounded needle, and also shattered that figure's kneecap with another needle's rebound. His skill is also so great, the thrown wooden needle can become embedded in stone.
By somehow utilizing his cloak, he can knock a lesser vampire out cold for several hours.
Left Hand
As most know, D's left hand is inhabited by a carbuncle. This creature is quit powerful on his own.
The carbuncle can consume and gain energy from the four elements, as well as energy attacks and more. It once sucked in a huge cloud of spiders in an instant, and is able to analyze anything it eats, licks, or touches.
In the 6th novel, it absorbed hurricane force winds capable of blowing D away.
It also sucked up a deep pool of water, and created a gale so strong that conjured soldiers were literally torn apart by it.
And it once sucked a nuclear lamp (said to be able to last 15 years) dry in a matter of minutes.
It can also invade the minds of those it touches, drawing forth knowledge, or anything else it desires.
As for the carbuncle's physical capabilities: Stopping swords with it's teeth, firing branches with insane speed, and biting through multiple tentacles in one pass are nothing to it.
At full power, it enabled D to escape from a sealed dimension, and put D in a state that can only be described as transcendent. Remnants of this state were able to block an attack from a being made out of pure energy.
And in the 9th novel it was able to concoct a substance from D's blood that allowed D to deal harm to Death Essence (literally Death in the form of a white mist, anything that came into contact with it would die or rot).
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"Give him a fair trial. Then shoot him." - Napoleon Bonaparte after the capture of Andreas Hofer