There are many different kind of skills combinations. I have here the list of Kael Invoker Basic Skill Combination and how to use it. Simply click any of the Basic Skill combination to learn it.
>Chaos Meteor +Defeanning Blast
>Tornado + Sun Strike
> Emp + Tornado
>Defeanning Blast + Sun Strike
>Tornado + Defeanning Blast
> Cold Snap + Forge Spirit
> Cold Snap + Alacrity
> Cold Snap + Chaos Meteor
> Ice Wall + Chaos Meteor
> Ice Wall + Emp
> Tornado + Chaos Meteor
Note:
This Basic combination is the best basic combination it self.