For starters I do like the weapon quite a bit, but It could probably use a few tweaks. In addition to my thoughts I'd like to see what everyone else thinks so far.
The only complaints I have for now are: Why doesn't it have any Defensive stats like other Halberds, even if trivial, give it at least Dragon Halberd stats. The Spec is almost useless, i don't really see why anyone would let Venom build up enough to even use the Spec. Sure it cures Poison/Venom but your not going to need that since you'd certainly have brought potions for that purpose. If you want to stay on theme maybe have the Spec inflict Venom, but start at 12 damage instead of 6 - possibly let it apply Venom to monsters that are usually immune? I know they didn't want this to be a big Spec weapon though.