Question

What is the best place to finish the Troll Champion bestiary in the whole Tibia?

Answer 1

The best one in my opinion are the Shadow Caves! usually known as Ab'Dendriel Troll caves!

You need to travel to Ab'Dendriel and have 50 gold coins in order to buy a key from Shirith. Once you do that, you can access the doors leading to the caves. During Rapid Respawn, these caves are a good choice for a Free Account!

However, pay attention that there is not really a dense population over there of Troll Champion, so make sure to try out this during Rapid Respawn, since the pace of the respawn will be much better!

You can check on it is this place here, where I walked around in the cave until the last floor:

https://www.youtube.com/watch?v=2UkZClfkOSA

Answer 2

I like best the Edron Troll Cave, which is located to the west from Edron. 

The entrance can be found here: