Editing HQ rules from M&M2e (section)

===DEFENSE SYSTEM===
A defense system consists of various weapon emplacements defending
the exterior and interior of the headquarters. A defense system can have
any attack effect with a rank no greater than the campaign’s power level.
These attack devices try to disable or restrain anyone approaching or
invading the headquarters. Their attack bonus is equal to the campaign’s
power level. Heroic HQ’s usually have nonlethal weapons while villainous
defense systems are often lethal.