Regular Damage is one of four physical damage types and is dealt by every straight sword, axe, great axe, ultra greatsword, and nearly every greatsword. While many inflict only Regular Damage, some inflict both Regular and Thrust, depending on which attack is used from its moveset.
Regular Damage is one of the most frequently encountered damage types and one can protect themselves against it in a multitude of ways.
As a general rule, the heavier an armor piece is, the higher its defense against Physical damage will be.
Light armor sets are not the best choice to reduce Regular Damage. The Xanthous Set and Lord's Blade Set are the heaviest of all light armors, and therefore offer higher defense against Regular Damage. Lighter armor sets that offer very good Regular Defense for their weight are the Crimson Set and Big Hat's Set.
The Ring of Steel Protection raises all forms of Physical Defense.
Unlike armor, shields modify damage based on a percentage and all forms of Physical damage are affected by its single modifier. Many of the standard shields and greatshields protect against 100% of Physical Damage; the Heater Shield, Dragon Crest Shield and Black Knight Shield are examples of these.