On the Xbox it's the LT on your Controller. wink

In my Manual (Xbox) I read about the LT :
Engage Lock Mode
If you want to concentrate on a single enemy, you can lock onto it by pressing and holding LT . This is especially handy if you're attacking with bows and/or long range spells. During lock-mode you can switch targets by nudging the R-stick sideways.


For the PC, sory, I don't know.

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 !