I am bad at the game so I edit the wiki

Item Cost +X Health Regen
Monster Rounds Souls500 +1
Kinetic Dash Souls1250 +1.5
Shadow Weave Souls6200 +15
Sprint Boots Souls500 +1
Extra Regen Souls500 +3
Healing Booster Souls1250 +2
Enduring Speed Souls1250 +1.5
Reactive Barrier Souls1250 +2
Extra Spirit Souls500 +1
Improved Cooldown Souls1250 +1.5
Suppressor Souls1250 +2.5
Decay Souls1250 +1.5
Duration Extender Souls1250 +1.75
Superior Duration Souls3000 +4
Improved Spirit Souls3000 +3
Superior Cooldown Souls3000 +4
Mystic Slow Souls3000 +3
Boundless Spirit Souls6200 +15