I find the Battle Tower a very nice aspect in the game.
Funny is that I, reading about Divinity II when D II wasn't not on the market yet, I had a total different image/picture about this Battle Tower in my mind .
Above all I was thinking of a more bigger Tower with also a deep dungeon benaeth the Tower or a secret tunnel to somewhere ... ? biggrin

On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !