Runescape Help And Guides

where is the place in varrock in runescape where there are a bunch of logs?

and if you use weaken on it it’ll turn into an evil tree spirit

Whoever told you that is lying -.-
No kidding. It is not possible to summon a tree spirit, except from a random event. Also you cannot use weaken on non monsters/players.

Runescape, Evil Maple Tree