Pantheon is stronger than ever with the new Assasin Items. It solves his two major problems:
1. ) Sometimes u cant oneshot a carry with q w e q - combination, and u are rather immobile.
2. ) U are rather immobile
With Duskblade u get this extra bit of damage every 2 minutes as well as 5 % Movespeed. Problems solved.
Rush for Duskblade and Swifties, then Black Cleaver. After this i recommend Steraks and a some defensive stats.
The most important thing with pantheon: Keep the snowball rolling. Get kill or at least 30 farm advantage before level 6, get a kill mid after level 6. Play ballsy, keep ahead in Level, TAKE THOSE FKING TOWERS. Once the enemy team reaches level 18, u propable lost. So end game before.