D20:Hammer, Gnome Hooked Weapon

A gnome hooked hammer is a double weapon. You can fight with it as if fighting with two weapons, but if you do, you incur all the normal attack penalties associated with fighting with two weapons, just as if you were using a one-handed weapon and a light weapon. The hammer?s blunt head is a bludgeoning weapon that deals 1d6 points of damage (crit ×3). Its hook is a piercing weapon that deals 1d4 points of damage (crit ×4). You can use either head as the primary weapon. The other head is the offhand weapon. A creature wielding a gnome hooked hammer in one hand can?t use it as a double weapon?only one end of the weapon can be used in any given round.
You can use a gnome hooked hammer to make trip attacks. If you are tripped during your own trip attempt, you can drop the gnome hooked hammer to avoid being tripped.
Gnomes treat gnome hooked hammers as martial weapons.

Gnome Hooked Hammer Material Enhancements

Material	Average	Masterwork1	Hardness	hp	Special
Steel	20 gp	620 gp	5	10	?
Adamantine	?	6,020 gp	5	13	Bypass hardness less than 20
Crystal, Deep	?	2,020 gp	10	30	Psionic
Crystal, Mundane	?	{{{mccost|620 gp}}}	8	25	No rusting, not metal
Darkwood	?	n/a	n/a	n/a	?
Iron, Cold	40 gp	640 gp	5	10	Magical enchantments cost an additional 2,000 gp.
Mithral	?	3,020 gp	5	10	1/2 weight
Silver, Alchemical	200 gp	800 gp	5	10	−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. This is the extra cost of enchanting only one head. Calculate the extra cost as if each head were a separate weapon. 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
  
• Wikipedia: Warhammer
  

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System Reference Document -> Equipment (SRD) -> Weapon Descriptions