For those of you who are not DnD players. This is the Terrasque. This is the thing that lets you know that the DM know is a sadistic bastard who hates you and your family.
 
This is the thing that is a pure fucking engine of destruction.
 
Every major video game boss that was near impossible to defeat is nothing compared to this thing.
 
This is the thing that would make Chuck Norris put in effort to defeat.
 
There is no monster in the DnD world that is near impossible to kill (Save maybe a prismatic dragon and Deity level characters) because not only will you need to be at super high level, not only will you need an army, not only will you need top teir magical items to even hurt this thing, but unless you have Wish or Divine Intervention/Miracle to rid of its remains it will not fucking die.