Tranquility is a level 37 Restorationdruidpoint blank area of effect group healing spell that heals all party or raid members every 2 seconds while the spell is being channeled. Tranquility produces a large amount of healing over a short period of time, but should be used with some care due to its 8-minute cooldown time, and the fact that the druid cannot move or cast any other spells while channeling it.
Patch 4.0.1 changed this spell to affect the whole raid, making it a far more effective spell in a raid setting.
Tranquility is very mana efficient when many party members need healing, but is very ineffective when only one or two players need to be healed. Use it only when most of the group needs to be healed at the same time, such as when a boss has damaged everyone around him.
Since patch 4.1.0, druids innately have 100% pushback protection from damage while channeling Tranquility. It is no longer necessary to cast [Barkskin] beforehand to avoid losing duration to damage.
As this spell produces a large amount of healing in a short time, it can cause a lot of threat. Warning the rest of your party beforehand can save your life, as the tank can prepare to force the aggro back onto themselves with taunts after the spell has started.
[Barkskin] will not protect you from [Kick] or [Counterspell]. These types of interrupts not only make you waste your Tranquility cooldown, but also disable the spell school, leaving a Restoration druid mostly helpless. Given that your druid will be waving their hands in the air, causing the air to glitter, and producing a distinct noise, it is unlikely to pass unnoticed in PvP.
Tranquility can be useful for healing targets not in your line of sight.
Tranquility is now only available to Restoration Druids.
Tranquility now heals every Party and Raid member within range every 2 seconds for 8 seconds. It no longer places a periodic effect on each target. The total amount of healing it generates in Raids should be approximately the same as before this change.
Patch 5.3.0 (2013-05-21): Now targets 12 raid members (up from 5) each time it heals when used in a 25-player instance. This change also applies to players using the Symbiosis version of Tranquility.
Patch 4.1.0 (2011-04-26): Druids now innately have 100% pushback protection from damage while channeling Tranquility. [Malfurion's Gift] now reduces the cooldown of Tranquility by 2.5/5 minutes.