[Essentials] Spider animal companion for drow druid

[shdwrnr]

Trying to create an animal companion for a player of mine. What do you guys think of this:

Spider Animal Companion
Medium Natural Beast
HP your bloodied value Initiative equal to yours
AC 15, Fortitude 13, Reflex 15, Will 13 Perception equal to yours +2
(add your level to each defense)
Speed 6 Low-light vision

Traits
Web Spinner * Aura 1
Enemies that start their turn in the aura are slowed and enemies that enter the aura must end their movement in that square.

Standard Actions
Animal Attack * At-Will
Attack: Melee 1 (one creature); your level + 5 vs AC
Hit: 1d8 + your wisdom modifier + your constitution modifier damage and the target is weakened (save ends).
Level 13: 1d8 + 2 + your wisdom modifier + your constitution modifier damage and the target is weakened (save ends).
Level 23: 2d8 + 4 + your wisdom modifier + your constitution modifier damage and the target is weakened (save ends).

Str 12 Dex 20 Wis 16
Con 17 Int 2 Cha 6

 

[DragoonLance]

I think the at-will weakened effect on top of the damage is way over the top. Spider should probably have poison damage somewhere but not sure where it would best fit in, especially as poison is weak in meta-game. I might have to look over the beast ranger for ideas as I have a Drow sentinel in my game and I'll bet she would love a spider companion.