The spirit beast blesses your allies, increasing all party and raid members mastery by x, and increasing their critical strike chance by 5%.
Spirit Beast Blessing is a hunterpet ability unique to spirit beasts that provides a buff to mastery and critical strike chance to all party and raid members.
Patch 6.1.0 (24-Feb-2015): Spirit Beast's Spirit Beast Blessing now also provides a 5% increase to critical strike chance. Does not stack with other critical strike chance buffs. Previously, other exotic pet families provided buffs to 2 stats while Spirit Beasts provided only 1.