Contrary to what the tooltip seems to imply, it actually heals or damages three times, the first tick occurring instantly upon cast.
Due to its mana efficiency and healing speed, it is generally the primary direct heal used by Discipline priests.
Like [Holy Shock], this spell has two ranges depending on its use. When used to attack, it has a 30 yard range; when used to heal, it has a 40 yard range.
Even if a pushback prevents the final tick from landing, this is still a more mana efficient heal than [Greater Heal], and will still heal more than [Flash Heal]. Pushback can only prevent one tick, as it can only cancel 50% of a channeled spell.
The instant first tick of this spell can save party members who would otherwise die while waiting for [Flash Heal] to cast.
[Divine Aegis] – Creates an absorbing shield when Penance heals critical.
[Grace] – A stacking effect that reduces the damage done and increases the healing received to the target. A fully channeled Penance will reward a full stack of Grace.
[Level 60], after spending 50 talent points in the Discipline tree. While channeled, it deals damage to an enemy or heals a friendly target.
[Holy Shock], this spell has two ranges depending on its use. When used to attack, it has a 30 yard range; when used to heal, it has a 40 yard range.
[Power Word: Shield] prevents pushbacks and ensures that the effect of Penance is fully used.
[Greater Heal], and will still heal more than 
