Block

​A character can declare that she is using one of her attacks to block an opponent's strike. Blocking is a hard parry with a weapon that deflects an opponent's attack. Any weapon except rope-like things such as nets, lassoes, or slings can be used to block. When a character tries to block an attack, she makes a normal attack roll against AC 4. Her opponent makes a normal attack roll against her Armor Class. The strike is blocked if the character succeeds with a lower roll than her enemy succeeded with. If the attacker failed anyway, it's a miss no matter what the blocking character rolled. If the blocking character failed but her attacker succeeded, it's a hit despite the block attempt.​

​​​If the character announces her block before initiative is rolled, she can block an attack even if it beats her action phase. If she decides to wait, she can only block attacks in her action phase or later. Blocking is an excellent tactic for characters with multiple attacks to use against characters or monsters with only one attack. A rapier specialist with a main-gauche in her off hand can use her off-hand weapon or one of the rapier attacks to block while using the rest of her attacks offensively.​

For example, Arweth is a 5th-level fighter with an adjusted THAC0 of 14 with her long sword. She is fighting a hill giant with a THAC0 of 9. Arweth decides to use an attack to block the hill giant's next strike. She rolls a 15 and succeeds with her roll. The hill giant rolls a 12; Arweth is AC 1, so the giant succeeds, too. His roll of 12 is lower than her 15, so Arweth's block fails.​

Must be proficient with weapon.
Uses 1 attack.
Decided before attacker’s attack roll
Procedure:
Defender: Attack vs. A.C. 4
Attacker: Attack targets A.C.
Success = lowest successful roll.​