Legildur said:
Is that a none-rules based response to a rules question by the Smurf? :\
It depends. For a start, I prefaced it with 'I personally'
Apart from that... the Two Weapon Fighting rules specify that you can make an extra attack when wielding a second weapon in your off-hand.
Armor spikes state that you can make a regular attack or an off-hand attack with them.
What does making an off-hand attack mean? It means -4 on the attack roll, and half Str bonus to damage.
Armor spikes don't state that they count as a second weapon wielded in your off-hand; thus, a strict reading would indicate that while you can make an off-hand attack with them, you cannot make an
extra off-hand attack with them. You are not two-weapon fighting; you are simply making an off-hand attack, much as if you elected to swing a longsword with your weaker or less-dextrous hand.
Now, we generally permit someone who is making an off-hand attack in addition to a primary attack to do so using the two-weapon fighting rules; since this is not a strict interpretation of the text of TWF, however, I don't consider disallowing an extra off-hand with armor spikes while wielding a greatsword to be less rules-based an answer than
allowing an extra off-hand with armor spikes while wielding a greatsword... and it offends my sensibilities less to forbid the double-dipping.
-Hyp.