Arcane Pulse is an Arcane Enhancement that provides a chance to heal nearby allies whenever a health orb is picked up.
Successfully completing the The Law of Retribution will award each member of the group a copy of the same random arcane. Invalid is a rare arcane and can be found extremely infrequently when completing a regular Trial; and frequently when completing a nightmare Trial.
This enhancement synergizes with Nekros' Despoil augment, as the augment makes Desecrate use Nekros' health to cast instead of his energy. Coupled with the health orbs generated with Desecrate this allows Nekros to heal nearby allies as he replenishes his own health.