Constitution score describe the general fortitude, tolerance and perseverance of a creature.
Creatures with a high Constitution can withstand sickness and disease, pain and damage. They can endure taxing actions like swimming for long periods of time, or walking through burning buildings. Low Constitution however describes a creature who hardly resists poisons and disease, who have a lacking stamina and who generally have a deteriorating or worse health.
Endurance
Endurance is the use of constitution and athleticism to perform athletic abilities during an extended period of time, withstanding possible exhaustion.
The movement actions a character perform requires successful Constitution (Athletics) checks. The check is called an Endurance check, which even dashing requires, however each movement action has an active time period in which additional rolls for that movement action is not required.
The DCs for movement actions range from 14 to 22, however, failing these does not mean total failure, to make up for the difference between the roll and the DC you can use Endurance Points. These endurance points recuperate while no movement action is active, at a rate of three times the active time period for the movement action you took. When determining success, you may use your passive score or the roll, whichever is higher.
- Endurance Points:
your Constitution score + your Athletics Proficiency bonus - Passive Endurance:
10 + your Constitution modifier + your Athletics Proficiency bonus