Editing Age of Sigmar/Tactics/Order/Sylvaneth (section)

===<span style="color:#4c741c;">Lords of the Clan</span>===

'''''Two to four Treelord Ancients and one to three normal Treelords'''''

During your shooting phase, every enemy within 6" of 2+ Treelords, gets D3 mortals on a 2+ roll.

At 60 points, this is a bargain given it's only 10 more than a command point, and If you really want lots of trees then this is a no brainer. Ability requires you teleport deep strike in pairs, but you won't get those mortals until ''your'' next turn after charging (assuming the whole pair stays alive). Having to take two Ancients is the tax here - most the Ancient's abilities don't double up, leaving your second Ancient mostly as a Treelord with a much lower damage output (however, you do get the additional spell plus the choice of which Ancient to use for its abilities).
Being forced to take in pairs is a good as the stomp becomes much more reliable (from 50% to 75%), with the chance you can stomp a second enemy.
For the most use out of this you want two pairs of Ancient+Vanilla, but that uses up almost half your points and all your behemoths slots in a 2000pt game. Two Ancients and one Vanilla is easier to build around, but that magnifies the Ancient tax and neuters the battalion ability. 
For pure damage output and survivability, Dreadwooding a large block of Kurnoth's is mathematically the better choice. However, two pairs of stomping Trees are much more flexible.
In addition, taking LOTC enables you to take a mixed battleline (say, one each of Spites, TreeRevs and Dryads) instead of the usual block of Outcasts or Forest Folk - or take both if you really want the artefacts/CPs.