Regardless of how many powers a caster knows or prepares, he or she can cast only a limited number of powers before resting. Each casting class’s description includes a table showing how many tech points a character can use at each character level. At-will powers always cost 0 points, while casting a power at any other level costs the power level + 1 points, as shown in the Power Level Point Cost table below. Finishing a short or long rest restores any expended tech points.

Casting in Armor

Because of the mental focus and precise gestures required for tech-casting, you must be proficient with the armor you are wearing to cast a power. You are otherwise too distracted and physically hampered by your armor for tech-casting.

Casting a Power at Higher Level

When a caster casts a power using at a higher level than the power's normal level, the power assumes the higher level for that casting. Many powers have more powerful effects when cast at a higher level, as indicated in the Overcharge Tech sections of the power's description

At-Will Powers

An at-will power is one that can be cast without expending force or tech points. Repeated practice has the power in the caster’s mind. An at-will power's level is 0.