So, I've noticed that The Nameless has resistance to Durability Negation listed on his profile, I have been told its due to resisting spells that are "casted and the opponent is now harmed" which doesn't sound like a resistance to it at all.
There's 5 types of resistances: Venom Resistance (VR), Disease Resistance (DR), Physical Resistance (PhR), Psychic Resistance (PsR) and Magic Resistance. First two are kind of obvious so not going to explain it, PhR is for reducing/ignoring (depending of the level of resistance or the "potency" of the power) any effect that alter the integrity of the body, PsR is for reducing/ignoring the effects that alter the state of mind and emotions, and MR not only reduce/ignore the effects of magic spells but also alterations of one essence.
I believe you're refering to the spell Injure or Induce Damage (or whatever is called in english), in whose case, they use RM, as the effect is from magical origin; so to resist it is not needed Durability Negation Resistance, but rather Magic Resistance.
I also believe that Durability Negation Resistance is pretty vague as there is countless of ways of negatig durability, in Anima there's several ways of ignoring durability, but depending of how they work, it may or not be possible to resist (for example, one can resist its molecular structure to be altered [PhR], but not some that Damage Energy [aka, damaging both the form and essence of the things]).
Thanks for that explanation. If you can I'd for you to comment on this thread where it twas brought up. The person I'm informing seems very set on the idea of resisting durability negation so if you could I'd appreciate if you could inform them otherwise.
Basically, anyone that damages energy ignores durability (with certain limit, based on Presence) as it bypasses the Damage Barrier of objects and beings by attacking both the form and essence of things/beings, although, not for that it ignores armor (as armor in this case is more about absorbing attacks and dissiping the damage). Effects such reducing Armor Type, increased Damage, increased Breakage (although only works in weapons and artifacts), increased Critical and Damage Energy can be considered to bypass durability, and yet it can't be resisted.
Sorry I have no idea, in theory, is still subject to the lethality values of overpressure (like 10 psi destroy concrete, 20 psi casues dead by barotrauma, etc), is just it do not use any known equation.
Sorry, I'm long retired from calculations, but can always trying to calculate it yourself. Not really difficult, just make a screenshot and scale the height of the guy behind the wheel (any part of the body works, as long you scale ii in a good angle and known its length), then scale it to the wheel, calculate the volume and then multiply it by its density (concrete).