Is a character wielding a two-handed reach weapon
(such as a longspear) and wearing spiked armor
threatening all squares within 10 feet? Assuming he has
Combat Reflexes, can he make an attack of opportunity
with his longspear and then with his armor spikes in the
same round?
A character wearing spiked armor threatens all squares
within his normal reach (5 feet away). If he also wields a
longspear, he would also threaten all squares 10 feet away.
Any time a character wielding more than one weapon is
allowed an attack of opportunity, he may use any weapon that
threatens the opponent who has provoked the attack. In this
case, imagine an enemy who charged the character and then
tried to disarm him. The charge attack would provoke an attack
of opportunity from the longspear as the enemy moved out of a
threatened square (in order to move adjacent to the character
and deliver the charge attack). Then, the disarm attempt would
provoke another attack of opportunity (assuming the enemy
didn’t have Improved Disarm). This attack of opportunity could
be made only with the armor spikes, since the longspear
doesn’t threaten an adjacent enemy.