As a swift action, the arcanist can expend 1 point from her arcane reservoir to create a barrier of magic that protects her from harm. This barrier grants the arcanist a number of temporary hit points equal to her arcanist level + her Charisma modifier, and lasts for 1 minute per arcanist level or until all the temporary hit points have been lost. Each additional time per day the arcanist uses this ability, the number of arcane reservoir points she must spend to activate it increases by 1 (so the second time it is used, the arcanist must expend 2 points from her arcane reservoir, 3 points for the third time, and so on). The temporary hit points from this ability do not stack with themselves, but additional uses do cause the total number of temporary hit points and the duration to reset.
Pathfinder Roleplaying Game Advanced Class Guide © 2014, Paizo Inc.; Authors: Dennis Baker, Ross Byers, Jesse Benner, Savannah Broadway, Jason Bulmahn, Jim Groves, Tim Hitchcock, Tracy Hurley, Jonathan H. Keith, Will McCardell, Dale C. McCoy, Jr., Tom Phillips, Stephen Radney-MacFarland, Thomas M. Reid, Sean K Reynolds, Tork Shaw, Owen K.C. Stephens, and Russ Taylor.