Burn everything
Lex teleported only a few times before he came close enough that he could estimate the location of the massive tree that he could see even from a distance. But, before teleporting over to it directly, Lex turned around and addressed the battalion.
"For most of you, this is the first time you're heading out to fight. This is also the first time you'll be striking any enemy in revenge, so I should make clear how exactly we will do this. The Tree of Heaven will be much more powerful than any of you, so you will not be fighting the tree. Instead, that will be my job.