Default: DX-4
Fencing (DX/Average) is a depreciated cinematic Classic skill that is now "built-in" to various Swords skills.
It's special abilities were parry twice per turn, instead of just once with All-Out Defense, allowing one to parry any number of attacks each turn. Parrying was at 2/3 Fencing skill (round down).
Its limiting factors were being at no greater than light encumbrance and having no more than a small shield.