Trolls should really not be able to climb ladders. It makes them more realistic and makes a team have to work more tactically to get trolls to some locations.
Also, troll fall damage should be way higher. Trolls can fall off a siege tower and survive in Minas Tirith? That should not happen.
Also, troll fall damage should be way higher. Trolls can fall off a siege tower and survive in Minas Tirith? That should not happen.