I recommend taking heartseeker at level 3 or 4, because of it's passive. It's a killer.

EDIT: Also, you can move away when you used Heartseeker Strike.
However, even though the animation goes on I don't know if the damage does aswell. Someone should give that a test.

I think that you can move while its in use... Also if you want to make the best of it, get a Phage or Frozen Mallet. HsS is effected by FM slowig passive.

Im glad I could help

Thanks for the feedback Chaotic Bliss.
Ive used your panth guide and think its epic :3
Im defo trying the whole defensive 5-6th items and defensive talents, although ill miss my move speed and 5mp5 :'(

The main reason i made this guide is I don't like Heartseeker, i like to move around within a fight instead of being rooted for 2-3 seconds firing off a easily dodge able cone.

Thanks again :)

I like the fact that you are building a lil bulky, you need to add a lil more. Maybe taking out the IE and BT, you can add some other bulky items. BV maybe? or a GA might help too. Also, you might want to dip into the defensive tree for some more bulk. Its nice though. Very nice. Ill give it a try.

If you want to see a lil more bulky Pantheon, peek at my build. Its bulky and still does great as a single DPS