Heroic Reactions

Block/Dodge

(Replaces the Dodge action) This is where AC comes in. Reduce damage from any single attack by your AC modifier (AC–8). At the DM’s discretion, some damage may not be avoidable (i.e., psychic damage, or some areas of effect).

Opportunity Attack

A melee attack made with disadvantage when an adjacent enemy moves away. Common monsters do not make opportunity attacks. Only PCs, legendary monsters, bosses, or other leaders (as determined by the DM) that are “a cut above the rest” can use them.

Interpose

If an ally within 10 ft. would be struck with an attack, you can push them out of the way and become the new target of the attack. You enter their square and move them to an adjacent square of your choice.

Help

Grant an ally advantage on an attack, skill check, or saving throw if you can reasonably explain to the DM how you could help in a given situation. The DM may call for a skill check or grant advantage automatically, depending on how good the idea is. Limit of one help reaction for each roll.

Assess

In combat, a PC can spend 1 AP to make a skill check to uncover information, spot a weakness, intuit enemy tactics/plans, etc.