Dual Beam Dreams
Use rune magic to open a glowing blue dome in Attilan.
Use magic or teke to destroy the CAUTION LASER AREA sign.
Use a sonic attack to destroy the figure with glass armor (a Tamriel import?).
Use the pieces to build a deflect pad. Mount it to fend off two lasers at the same time. You need to direct the beams into the two sensors at the end of the walkway ahead of you, but you don't have to activate them both at the same time.
Once you've lasered both sensors, your brick will appear.