Abilities/Constitution

This is how well you are able to take damage and resist poisons. Everyone can benefit from having high constitution scores because it increases your HP (Hit Points).

Concentration Skill
You must make a Constitution (Concentration) check whenever you might potentially be distracted (by taking damage, by harsh weather, and so on) while engaged in some action that requires your full attention. Such actions include casting a spell, concentrating on an active spell, directing a spell, using a spell-like ability, or using a skill that would provoke an opportunity attack.

Endurance Skill
Your DM/GM may ask you to perform a Constitution (Endurance) check when performing activities for extended periods of time, such as swimming or running.