(As seen in this story)
Sign of Thanh
This Sign is a glowing rune, drawn in the air with one fingertip. It remains in place for as long as its caster concentrates, visible even in darkness and potent to a range of about fifty meters. All who look upon the Sign must pass a Psychic save or be paralyzed, unable to move voluntary muscles and barely able to breathe, until the Sign is allowed to fade. A caster who looks at his or her own Sign after its creation may also be frozen, and will maintain it involuntarily until his or her strain meter is full and he or she has to make a break roll.
The case difficulty is d8 and the base cost is one strain per round. This can be extended to one per minute by increasing the difficulty by two steps, or the difficulty can be lowered one step by doubling the cost per round. By taking on additional strain when the Sign is first drawn, the caster may add a penalty to others’ saves (on a one-for-one basis).