Defenseless (M&M3)
A defenseless character has active defense
bonuses of 0. Attackers can make attacks on
defenseless opponents as routine checks (see Routine
Checks). If the attacker chooses to forgo the routine
check and make a normal attack check, any hit is
treated as a critical hit (see Critical Hits).
Defenseless characters are often prone, providing
opponents with an additional bonus to attack checks
(see Prone).