U need armor (shoes, pants, jacket) with stat CON.
the higher the value CON the more LP u will get.
CON (Contitution): For every 1 CON point we will gain 75 until 105 LP, and it will also increase the LP regeneration. (May vary depending on each class / race)
Oohh! See if i knew that before , maybe i would have checked out the auction house more often . Thanks for the heads up