D20:Armor Spikes Weapon

You can have spikes added to your armor, which allow you to deal extra piercing damage on a successful grapple attack. The spikes count as a martial weapon. If you are not proficient with them, you take a ?4 penalty on grapple checks when you try to use them. You can also make a regular melee attack (or off-hand attack) with the spikes, and they count as a light weapon in this case. (You can?t also make an attack with armor spikes if you have already made an attack with another off-hand weapon, and vice versa.)
An enhancement bonus to a suit of armor does not improve the spikes? effectiveness, but the spikes can be made into magic weapons in their own right.

Spiked Armor Material Enhancements

Material	Average	Masterwork1	Hardness	hp	Special
Steel	+50 gp	+350 gp	10	*2	?
Adamantine	?	+3,050 gp	20	*2	Bypass hardness less than 20
Crystal, Deep	?	+1,050 gp	10	*2	Psionic
Crystal, Mundane	?	{{{mccost|+350 gp}}}	8	*2	No rusting, not metal
Darkwood	?	n/a	n/a	n/a	?
Iron, Cold	+100 gp	+400 gp	10	*2	Magical enchantments cost an additional 2,000 gp.
Mithral	?	+5,050 gp	15	*2	1/2 weight
Silver, Alchemical	+70 gp	+370 gp	8	*2	−1 damage
Masterwork weapons have a +1 enhancement bonus on attack rolls. The SRD gives neither this value nor a means to accurately determine it.

Magical/Psionic Weapon Enhancements

Bonus Value	Additional Cost1	Hardness Increase2	Additional hp2
+1	+Template:formatnum: -- template expr: 40 50 gp	+2	+10
+2	+Template:formatnum: -- template expr: 160 50 gp	+4	+20
+3	+Template:formatnum: -- template expr: 360 50 gp	+6	+30
+4	+Template:formatnum: -- template expr: 640 50 gp	+8	+40
+5	+Template:formatnum: -- template expr: 1000 50 gp	+10	+50
+6	+Template:formatnum: -- template expr: 1440 50 gp3	+12	+60
+7	+Template:formatnum: -- template expr: 1960 50 gp3	+14	+70
+8	+Template:formatnum: -- template expr: 2560 50 gp3	+16	+80
+9	+Template:formatnum: -- template expr: 3240 50 gp3	+18	+90
+10	+Template:formatnum: -- template expr: 4000 50 gp3	+20	+100
+11 or more	+ bonus × bonus × Template:formatnum: -- template expr: 400 50 gp	+ enhancement bonus × 2	+ enhancement bonus × 10
Increase total cost for magical enhancement by 2,000 gp for cold iron weapons. Unlike the additional cost, the increase the weapon's hardness and hit points are only gained from its enhancement bonus, not its special abilities. If the weapon has a magical bonus greater than +5 or a special ability worth more than +5, the weapon is epic. Multiply magic cost by 10.

• Weapon Qualities
  
• Magic Items: Weapons
  
• Magic Items: Armor
  
• Equipment
  

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System Reference Document -> Equipment -> Weapon Descriptions