Blockability
The ability to block.
For example, if one day a wild horde came banging upon your door you would be wise the assess the blockability of the door between yourself and the wild horde.
As another example, if one day you were wandering in a forest and find yourself separated from a beast by a fallen tree the blockability of the fallen tree could save your life.
As another example, if one day you were wandering in a forest and find yourself separated from a beast by a fallen tree the blockability of the fallen tree could save your life.