Talk:Kalista/@comment-4636093-20141107140636/@comment-4636093-20141107211120

That would be your 'target champions only' button. It means that while holding it any action you do completely ignores minions and monsters.

On my European keyboard it's bound to ` by default (to the left of the 1 key), although I've heard that on American Keyboards it's bound to ~.

You'll need to have a look through the options for it.