When activated, your next Nature spell with a base casting time less than 10 sec. becomes an instant cast spell. Nature's Swiftness shares a cooldown with Elemental Mastery.
For Nature's Swiftness, see Ancestral Swiftness (disambiguation).
Nature's Swiftness is a Shaman ability from the Restoration tree. This ability, when activated, causes the next nature spell with a casting time less than 10 sec to be instant. For example, activating Nature's Swiftness and then casting [Lightning Bolt] will instantly hurl a Bolt without that spell's normal 2.5 second casting time. Nature's Swiftness does not affect channeled spells.
After activating Nature's Swiftness, a buff appears indicating the next cast will be instant. This buff will remain indefinitely until the effect is used, or until the player dies. The two minute cooldown will not begin until this buff is consumed.
This spell can be very helpful when you need to cast an emergency heal spell.
Allows an instant shift to [Ghost Wolf] form for escaping.
Making a spell instant is an excellent workaround to counterspell effects and pushback.
Nature's Swiftness can be dispelled or spellstolen. Because Nature's Swiftness doesn't trigger the global cooldown it can be used in macros to cast and instantly consume it to prevent this.
Patch changes
Patch 3.2.0 (2009-08-04): Cooldown is now 2 minutes, down from 3 minutes.
[Lightning Bolt] will instantly hurl a Bolt without that spell's normal 2.5 second casting time. Nature's Swiftness does not affect channeled spells.
[Lesser Healing Wave], 
[Chain Heal], 
