Can you explain Nature's Grasp?

Omen of clarity is a self magic buff. Whenever you strike an enemy and hit, you have a chance of getting an Omen of Clarity buff to your character, making your next spell mana free or ability energy/rage free. Nature's Swiftness is a self buff useable once every three minutes. It makes any of your nature spells instant cast, and goes away as soon as you cast a nature spell. Lastly, Nature's Grasp is a self buff. It lasts 45 seconds, and will attempt to root any melee enemy who strikes you. It can be resisted, and fades once it is cast on an enemy (even if they resist).

The buff for Omen of Clarity is independent of weapon speed. It is set to go off a certain number of times per minute, and will go off as many times with a slow 3.8 speed mace as it will with a fast 1.3 speed dagger. This is of course, assuming you hit as often with your slow weapon!

Innervate gives you 400% increased mana regen in combat for 20 seconds once every 6 minutes. What this means, is that in combat while casting spells you will regenerate mana 4x faster than if you were NOT even in combat! This spell is directly benefited by spirit which increases your hp/mana regen. You regenerate at the same rate whether you are casting or not.

Swiftmend consumes the heal over time portion of either regrowth or rejuvenation on your target. It will take your +healing into consideration when consuming this, and provide the full effect of that heal over time as an instant heal on a 15 second cooldown. This means that you can allow your rejuvenation to heal for all but the last tick, swiftmend, and essentially get two heals out of that one rejuvenation/regrowth. It is useful on many end game encounters and in pvp. Working with another druid, you can mimic nature's swiftness by having one druid rejuv and the other swiftmend immediately, providing a powerful instant heal.