I used Incite Unholy Frenzy as the base for a bonus ability for a hero. It is not used as a hero ability. The only difference between it, and the Necromancer ability is that it has friendly units specifically listed as a target, rather than friends and enemies. However, the spell does not actually manage to frenzy things under this targeting parameter.
Using this ability in a multiplayer custom game caused an immediate desync of 3 players. Something is not right with this spell.