Items on Eredar, Shadow Demon
I've been playing Eredar for three times already, and while I think he's not as powerful as Thrall or Gyrocopter, I think he is a fun hero to play. I don't really use the second skill as much, and while I do see the power of the first skill, it looks better on paper than in action. I was actually thinking 6.5 seconds was amazing in a team battle, but in reality it's just too short a time to really have any major effect in a team battle.
I tried Blink Dagger on him and tested whether it will work after Disruption, but it doesn't. If you were damaged by an enemy hero, even with the 2.5 seconds of Disruption, you wouldn't be able to blink. I tested that against a real opponent.
The second skill is also situational at best, although it will also aid in team clashes. The only skills I really respect and use a lot are his third skill and his ultimate, which really helps during ganks. I think Eredar should be played as a ganker, but since it's not really that easy to farm with him (he's a very potent lane hero, but after the early game I think he has to roam rather than farm to maximize his effectiveness) with his role, I think relatively cheap items should be attempted. Guinsoo is pretty difficult to attain, in my experience.
Dagon is one of the items I would get on him. It's very effective with the poison stacking and the Purge, and Dagon's a great way to reduce the enemy hero's life so that Purge and Poison can do their damage most effectively.
What items have you gotten on him?