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Maybe you should google how to think for yourself, mother fucker
*I'm not talking about MMOs by the way, y'all don't wanna see my fully unhinged, 
- tier rant about that fundamentally misguided genre of WoW-clones
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I'm going through a terrible time and am feeling compelled to share my aggressive thoughts 
Meta-gaming is a fucking blight, death to America
The point of the Tree Sentinel is to set the tone of the game. In most RPGs the world is built for you and more or less caters to your success. The tree sentinel is there to tell you that the lands between are not like that and losing vigilance for a few seconds will kill you.
Also I recommend crouching and hooking as far around it as possible. If you are running past the tree sentinel or trying to fight it, you've already died.