Weapon

Common

Guard. Guard weapons are made to fight defensively, often designed with a long reach or flat surface for parrying. While wielding a Guard weapon, whenever a hostile creature moves within your reach, and you did not move on your last turn, you can use a reaction to make a weapon attack with a Guard weapon against that creature. If the attack hits, then it deals no damage, the creature immediately stops and its speed becomes 0 until the end of its turn.
Heavy. The size of a heavy weapon makes it difficult to wield. Creatures with less than 15 Strength have DisADV on attacks they make using a heavy weapon.
Two-Handed. This weapon requires two hands when you attack with it.
Staff. You have ADV on Opportunity Attacks made with a staff. Opportunity Attacks made against you have DisADV while you are wielding a staff. When you take the Disengage Action and move away from a creature within your reach, you can make an Opportunity Attack with a staff you are wielding against that creature, before leaving your space. You only gain this benefit if you are proficient with the weapon.
Bludgeoning. On a critical hit, the target is knocked 5ft in a direction of your choice and falls Prone.

Martial Special Attacks

When you land any attack in combat you can choose to make it a Special Attack by expending one of your extra attacks. The additional bonuses below are either added immediately to the attack you just landed for extra effects OR expended before you make the attack for ONE all-in strike.
Each of these Martial Special Attacks have certain requirements and if the target needs to make a save, it's always against your Martial Save DC.

Staff. On a hit, you can forgo 1 extra attack to force the target to make a Str or Dex Save (target’s choice). Failure. The target takes 1 extra die of damage from the attack and falls Prone.
Martial Save DC. (8 + prof. bonus + Strength or Dexterity modifier)
Cleave. On a hit, you can forgo 2 extra attacks to make a wide swing with your weapon and choose a target within your reach. You can make a melee weapon attack against that target and up to 2 targets adjacent to it that are also within your reach. Use the same attack and damage roll against all creatures.
Concussive Strike. On a hit, you can forgo 1 extra attack to force the target to make a Con Save. Failure. The target becomes Stunned until the end of your next turn. Once Stunned from this Special Attack, a creature is immune to the technique for the next 24 hours.
Martial Save DC. (8 + prof. bonus + Strength or Dexterity modifier)
Stagger (Combo). On a hit, you can forgo 1 extra attack to force the target to make a Con Save. Failure. The target becomes Vulnerable to the next source of Slashing, Piercing, or Bludgeoning damage before the start of your next turn. You can only do this once per combat.
Martial Save DC. (8 + prof. bonus + Strength or Dexterity modifier)