This page gives a brief overview of the Restoration Druid artifact weapon, G'hanir, the Mother Tree, with a focus on what trait paths you should take when starting out. While you’ll eventually have all of the traits unlocked, there are a few different paths you can take to get there.
You unlock traits by gaining Artifact Power, which is obtained from doing nearly anything in game, including: world quests, dungeons, raids, and PVP. Once you have enough Artifact Power for a new trait, you must go back to the Dreamgrove (Druid Order Hall) to select your new trait at the Seed of Ages, located to the west of the Circle of Spirits.
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Below, you'll find recommended paths to take with your first 35 artifact traits.
Mana Efficiency (Green) | Throughput (Blue) | Utility (Yellow)
I recommend starting with the mana efficiency (green) path. Mana will be much tighter in Legion and this path focuses heavily on reducing the mana cost of spells, increasing the duration of your spells, and even giving you completely free bonus spells from the Power of the Archdruid trait at the end.
With the mana efficiency path done, I recommend going through the throughput (blue) path next. This provides the highest raw healing increase. The Dreamwalker trait at the end even provides additional mana efficiency along with more throughput.
Finally, you can go through the utility (yellow) path, or just fill in traits as you see fit. I recommend getting to the Tranquil Mind trait as quickly as possible. It’s easily the best utility trait on the artifact, eliminating one of the huge drawbacks Tranquility has.
After unlocking all 35 initial traits, you'll be able to empower your weapon with a short quest line, starting with The Broken Shore: Investigating the Legion quest. Empowering your weapon unlocks a new, small trait tree and allows you to increase all of your 3-point traits to 4-points. Below is my recommendation for the order you should get the empowered traits.
This order focuses on picking up consistent throughput increases, followed by consistent mana efficiency increases, and finally less consistent increases for both. The order is based on simulation data as well as my own feelings on how effective each of the traits are in normal healing situations.
Artifact Relics are primarily used to raise the item level of your artifact weapon. They also provide a bonus rank to any number of artifact traits. You can put relics into your weapon just by Shift+Right-clicking the weapon. Note: if you overwrite a relic with a new one, the old relic is destroyed.
In most cases, you'll want to use the relic that grants your weapon the highest item level increase. If you're picking between two relics of the same item level, you can pick the relic that buffs a trait from one of the paths above that feels most relevant to what you need. You'll likely want to buff your Mana Efficiency early in the expansion, and then Throughput later.
Below are the top traits to consider buffing from each path.
April 21, 2017 - Made a very small update to the Grid saved variables on the addon page.
April 16, 2017 - Moved Aman'thul's Wisdom up the legendary BiS list. It's performing very well in real-life logs. Updated Grid saved variable file on downloads page.
April 6, 2017 - Fixed BiS trinkets for large-group healing being out of order on the page and in the spreadsheet.
March 31, 2017 - Completed the full 7.2 gear and simulation overhaul for best in slot lists, trinket rankings, etc.
March 26, 2017 - Updated Talents and Builds page with new talent system that supports displaying multiple builds. Added information for Raiding and Dungeon/M+ builds.
March 23, 2017 - Reviewed and updated guide for 7.2, including new artifact traits and minor talent updates.
March 20, 2017 - Added initial addons page with Grid and WeakAuras overviews.
March 17, 2017 - Updated legendary item list with simulation data.
February 21, 2017 - Did a full review and update of all trinket ranking information.
February 12, 2017 - Added Perfectly Preserved Cake to BiS trinket list, below Etraeus' trinket and the legendary trinket.