Cleon
Legend
Switching to Lightning Reflexes and keeping the rest sounds good to me.
Let's do skills then!
A regular treant has 30 skill points the following ranks:
Skills: Diplomacy 0, Hide 0, Intimidate 5, Knowledge (nature) 5, Listen 5, Sense Motive 5, Spot 5, Survival 5
Those skills look pretty apt, but we'll have to shave off 10 ranks. How about cutting out the Knowledge and Sense Motive? I could see dropping Intimidate instead of Knowledge, but would like to keep them ignorant and menacing!
Skills: Hide 0, Intimidate 5, Listen 5, Spot 5, Survival 5