- “Small elemental saplings grow into treants, fierce defenders of forests and groves.”
Treants are powerful, ancient trees and more primitive forms of the wise Ancients that served under Cenarius in ages past. Treants resemble large moving trees with faces. Over time, treants also grow to be ancient protectors. 
They are closely affiliated with druids, and are often seen accompanying powerful druids and keepers of the grove. Many treants were driven mad during the Third War. The destruction of the forests, as well as demonic corruption, has driven them to lash out at anyone that approaches. Pandaren have, on rare occasions, infused their drinks with corewood from the treants to the west of the Dread Wastes.
The lowest level treants are found in the southern reaches of Sunstrider Isle, from the Shrine of Dath'Remar all the way to the bridge. The lowest level hostile treants are the Level 9 Withered Green Keepers in the Eversong Woods. In past times they assisted the blood elves in gardening the Isle, but have since grown out of control. The treants of the Ghostlands are also remnants of former allies of the Blood Elves, but retaliated when the Blood Elves were forced to burn the woods surrounding the Ghostlands to prevent further intrusion by the Scourge. Now, the Withered Green Keepers, led by Old Whitebark have turned against their former allies an attempt to foster the regrowth of their forest.
Level 13 Corrupted Treants that can be found in Middenvale on Bloodmyst Isle. Level 26 Corrupted Treants can be found just south of the border of Felwood, in Ashenvale. In Felwood, treants can be found in Irontree Woods, roughly level 52. There are a few treants which are for the most part passive in Feralas. Many hostile corrupted treants can be found in Dire Maul in the east wing. There are also treants defending Darnassus.
Technically there are treants in Terokkar Forest: They were once trees, but following the explosion in Auchindoun, the magic corrupted them and they became animated. In Outland you (as an Alliance player) introduce treants into the ecosystem in Blade's Edge Mountains, while the Cenarion Expedition seeks to heal lands once belonging to the treants and ancients. This quest calls for you to speed up growth of Grove Seedlings which, when fully grown, become Living Grove Defenders, neutral to the Alliance and hostile to the Horde. Treants have also been spotted in Crystalsong Forest and Pandaria and are both neutral and hostile.
As a companion pet
- Ruby Saplings can be captured in pet battles in Eversong Woods.
- The is sold by the Argent Tournament vendor Rook Hawkfist <Darnassus Quartermaster> in Icecrown at a cost of 40 .
- is a quest reward from . Horde players can obtain it by purchasing it from Apothecary Furrows in Cliffspring Hollow.
- is a reward from .
Druids and Treants in World of Warcraft
This section concerns content exclusive to World of Warcraft.
- is a talented druid ability, available at level 60. It summon 3 treants under the druid's command for 15 seconds, whose abilities vary according to specialization. The name of the ability is a reference to the Keeper of the Grove ability of Warcraft III.
- The is a vanity druid form that is taught by the minor glyph .
- restoration druid talent allows the druid to temporarily shapeshift into a treant like form (a unique model also used by some treant NPCs).
- Two pieces of the Obsidian Arborweave Regalia grants you a chance to summon a Burning Treant to assist you in battle for 15 sec when you cast or .
- Main article: Treant (Warcraft III)
In the RPG
This creature looks to be a short, angry tree-man. Its branchlike arms end in three-fingered claws. Treants are small, tree-like beings. They are rarely seen in times of peace, but in days of conflict they patrol the forests and fling themselves at nature’s enemies. Treants do not speak, but they understand Darnassian. Little is subtle about a treant's tactics. They charge their enemies as soon as they can, slashing with their wooden claws.
- World of Warcraft
Elder Treant in Val'sharah.
- Warcraft III
A treant sapling in Hearthstone.
"Pine devil" concept art.
Treant from Heroes of the Storm created by Malfurion with after taking the Talent Vengeful Roots.
Notes & trivia
- In the early Warcraft III beta, the treants were originally called ents, like the race of sapient trees in the works of J.R.R. Tolkien. The ent was supposed to be the peasant unit of the night elf race, being able to transform into Ancients. The corrupted treant creeps are still referred to as "Corrupted Ents" on Battle.net, and there are several treants being called "ents" in World of Warcraft.