Endurance effects your move speed and roll quality.
Base Max Equip Load = 42.5
Equip Load = 35 + 1.5*Endurance
Fused Metal Ring increases Endurance by 3 points.
Split Mask increases Endurance by 3 points.
Each point increase load by 1.5
Endurance is the only stat in Salt and Sanctuary that does not have a soft cap of 50. Points above and below 50 will all yield a load increase of 1.5.