You can create a field of darkness centered around yourself, with a radius equal to the Action Result. It lasts until the end of the sequence. If the schtick is taken more than once, it stays on one complete sequence per extra schtick pick.

Feel free to select some other sight obstruction if you don't like darkness.

Creatures relying on sight suffer a two-point impairment on all actions while inside the darkness, and any ranged attack or action into the area suffer a -2 modifier. Creatures with Darkness or some dark sight ability ignore these penalties.