Continuous changes are made to PVP on the server, to produce a more fun and even experience.
HCFations constantly changes the system in order to balance the comabt and keep it fun for all. These are the current restrictions as of the start of map 17 and version 1.7.5.
Sword: Sharp 3, Fire Aspect 2
Bow: Power 5, Flame 1, Infinity 1
Armor: Protection 3, Unbreaking 3, Feather Falling 4