Patch 8.0.1 (2018-07-17): Now once again heals allies in range, now learned at level 33, now also usable by Discipline priests.
Patch 7.2.5 (2017-06-13): Damage of Holy Nova increased by 14%.
Patch 7.1.0 (2016-10-25): Now learned at level 26. Holy Fire reset moved to Rank 2, learned at level 36.
Hotfix (2016-09-23):Holy Nova damage reduced by 16%.
Patch 7.0.3 (2016-07-19): Now available to Holy instead of Discipline. Damage increased by 420% but no longer heals. Now has a 20% chance to reset the cooldown of [Holy Fire] when it deals damage.
Hotfix (2014-11-05):Healing has been decreased by 15%.
Patch 6.0.2 (2014-10-14): No longer available through a Major Glyph, and is instead a Discipline specialization spell. Its mana cost has been lowered and its healing increased. It is intended as the efficient area-of-effect (AoE) healing spell for Discipline priests.
Hotfix (2011-01-18): Priests who were unable to learn Holy Nova will now be able to train the spell.
Patch 4.0.1 (2010-10-12): Mana cost reduced to 15% of base mana. Glyph of Holy Nova reworked.
Patch 3.1.0 (2009-04-14): Mana cost reduced approximately 20%.
Patch 3.0.2 (2008-10-14): Mana cost reduced. This spell was changed to no longer be obtained via a Holy talent. It has since been learned from a trainer, while its place in the Holy tree has been taken by [Desperate Prayer] with the removal of priest racial spells.
Patch 2.3.0 (2007-11-13): Now gain additional benefit from spell damage and healing bonuses.
Patch 2.1.0 (2007-05-22): Rank 2 will no longer receive double the intended increase in range from Holy Reach.
Patch 1.10.0 (2006-03-28): Self cooldown on this spell removed. Mana cost increased.
Patch 1.4.0 (2005-04-19): Now causes an explosion of holy light around the caster, causing Holy damage to all enemy targets within 10 yards and healing all party members within 10 yards. These effects now cause no threat as opposed to reducing threat temporarily.