Psionics are known for their mastery of mind. They are so good at using their mind, that they can cast spells without need of magic words, simply by creating the right thought and sending it to the world. However, every joke costs something, and casting without magic words increases manacost by 50%. Why to use it? When you say nothing, how can enemy know you are cause of his problems, right? However, combat spells are cause so intense mental connection that it starts normal combat as normal casting, but of course only when your spell succeed.