Bastard Sword

Also known as a Hand-and-a-Half Sword, is typically a slightly lighter variant of the long sword with a shorter hilt that the second hand can still grab. A Bastard Sword can also refer to an ordinary longsword if it is used in a fighting style that utilizes both single and double-handed techniques, as opposed to only double-handed.

Additional Weapon Properties. 

Parry. If a creature hits you with a melee attack while you are wielding a weapon with the parry property that you are proficient with, you can use your reaction to add half your proficiency bonus to your AC for that attack, potentially causing it to miss. If you are wielding two weapons with the parry property, you add your entire proficiency bonus instead, so long as you have proficiency with both items.

Variable. These weapons can deal multiple damage types, and inflict different effects as a result. When you attack with a variable weapon, it gains the corresponding property for that attack: Bludgeoning attacks gain the staggering property, piercing attacks gain skewering, and slashing attacks gain slicing.

• Staggering. These hard-hitting weapons daze on impact. When an attack roll with a staggering weapon exceeds the target's AC by 5 or more (or lands a critical hit), prevents the targeted creature from taking reactions and reduces its passive Perception by 5 until the start of its next turn.

• Skewering. These precise weapons reward focused attacks and punch holes in enemy defenses. When an attack roll with a skewering weapon exceeds the target's AC by 5 or more (or lands a critical hit), the next attack made against the target gains a bonus equal to your proficiency bonus.

• Slicing. These wicked weapons cut gaping wounds into the flesh, causing profuse bleeding. When an attack roll with a slicing weapon exceeds the target's AC by 5 or more (or lands a critical hit), the target takes additional necrotic damage equal to your proficiency bonus. Constructs, elementals, most undead, and other targets that do not bleed may be immune to this damage at the discretion of your DM.

Sweeping. These weapons strike in broad motions. When you reduce an enemy to 0 hit points with a sweeping weapon, you can target another creature within 5 feet of the first that you can reach and, if the original attack roll can hit it, apply any remaining damage to it. If that creature is likewise reduced to 0 hit points, repeat this process, carrying over the remaining damage until there are no valid targets, or until the damage carried over fails to kill an enemy.

Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Weapon Property: Versatile, Damage, Combat, Versatile, Sap