Apart from the abilities mentioned in the above pages, there is one more -Mark of the Rift. It is completely independent of the rest of the abilities, which makes it unique. It can be used exclusively by your character and regardless of the class picked at the beginning of the game, its functions remain the same.
You receive the Mark of the rift automatically, which takes place during the In Your Heart Shall Burn quest. It is added to the quick bar right after you enter the caves, after you escape Haven. This ability forms a rift that pulls the nearby opponents in and deals high damage.
However, using the ability is strictly limited. It is not fueled by Stamina or mana. Instead, you need to have Focus points, which are much slower to get. There are two ways, in which you can obtain the points - by killing opponents and by using chains of abilities, as the entire party.
Note - It is not necessary that you use Focus to activate the Mark of the Rift only. It is also used by the most powerful of abilities available for individual specializations (one ability per specialization). Therefore, you need to choose which one you are in greater need of.