Your spiritual guardians are more powerful than those of most others.
Benefit: Whenever you cast spiritual weapon, spiritual ally, or a similar spell that grants you a spiritual guardian, that guardian uses your shaman level instead of your base attack bonus to determine its base attack bonus, potentially granting it multiple attacks. Additionally, it gains a +2 bonus on caster level checks to overcome spell resistance as well as on damage rolls.
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.