All hail the Lord of Trolls (All lanes build)
This is the build I use for Troll Warlord in every lane (I have played him many times in Mid, Safe and Off-lane, it works).
Troll Warlord is a very underrated hero that can deal massive amounts of damage and can be the pivotal hero to maximize a right click hero line up. He is probably the greatest 1v1 right clicker in the game save for a select few (CK/PA/PL).
Trolls usefulness is the highest in the mid game. Use Battle Trance to push down towers before they can react and focus out important enemies in team fights.