# ToL Aura Change Buffs Some Spells, Nerfs Others

Published on August 29, 2008 by PhaeliaAnalysis, Obsolete, Spells and Talents

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**Note:** As the Tree of Life aura was subsequently increased to a 6% bonus, this post is no longer relevant.

As briefly mentioned and discussed in my previous post, Blue: Changes to Buffs and Debuffs, a significant change is being made to the way that *Tree of Life* aura will function in Wrath of the Lich King. It will no longer afford benefit based on the Druid’s total Spirit but instead will function in the same was as a Paladin’s *Improved Devotion Aura*, providing a flat 3% increased healing to the raid. Although it was stated that the values listed were considered maximally-talented, it remains unclear whether 3/3 *Improved Tree of Life* will be required to meet the 3% bonus or whether it will afford an additional .45% bonus. Either way, this change will affect all spells based on their +Healing coefficient (or their corresponding spell power coefficients).

The TBC *Tree of Life* aura was a flat +Healing bonus that scaled with Spirit. It’s value decreased as +Healing increased, assuming Spirit stayed constant. Assuming they increased at the same rate, the value stayed the same. The WotLK aura is a multiplicative bonus that will instead scale with +Healing.

To help better explain the significance of this change, let’s consider two spells called *DirectHealage* and *Hawtness*. At your current +healing, *DirectHealage* derives 25% of its total amount healed from +Healing while *Hawtness* derives 75%. If you were to boost your +Healing by 8%, *DirectHealage* would get a 25%*8% = 2% total boost. *Hawtness*, on the other hand, would get a 75%*8%=6% total boost. With the new aura, both spells would simply get 3%.

This means that spells with high coefficients (*Lifebloom*, *Chain Heal*) will be nerfed by this change while spells with lower coefficients (*Nourish*, *Regrowth*) will be buffed. We can use the following formula to determine how much Spirit would be required under the current *Tree of Life* aura (25% of Spirit converted to +Healing) to match the new aura’s bonus:

Spirit = 4 *(((+Healing * +Healing coefficient) + base healed) * aura bonus) / +Healing coefficient

By applying this formula to the 3% and possibly 3.45% auras and using numbers previously determined in Direct Heals in Wrath, we can graph these values of Spirit at increasing values of +Healing.

Assuming you have somewhere in the neighborhood of 600 Spirit and 2000 +Healing at the conclusion of TBC, this change represents a nerf to triple-stacked *Lifebloom* and *Chain Heal – *two spells with the highest +Healing coefficients – and a buff to both *Nourish* and *Regrowth*. Although the base amount healed is also a determining factor, you can generally expect heals with higher coefficients to have been reduced in effectiveness by this change while those with lower coefficients to have been increased.