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Old 09-10-2011, 09:04 AM   #56
Doctor of GURPS Ballistics
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Join Date: Sep 2004
Location: Burnsville, MN
Default Re: Rejiggering Muscle-Powered Weapon Damage

This is a draft of a Pyramid article that I decided opened up too many cans of worms, and pulled it.


While firearms are explicitly on an energy-based scale that doubles penetration for every quadrupling of energy, melee weapons do not scale this way, and the raw damage rises much faster, making high ST unrealistically effective when applied to hand weapons and muscle powered ranged weapons.

For an alternative take that scales the same way as firearms, consider rescaling thrust and swing damage. A cinematic scale would have thr equal to ST/10, and swing equal to ST/5; a more realistic one might have thrust as ST/20, and swing as ST/10.

Oddly Small Damage Increment Table
Roll one off-color die, and adjust the number rolled to the table value. The Notes entry shows where rules of thumb can be used to more quickly interpret the roll of the odd die. Each entry is scaled to give an average result consistent with a fractional d6.
		                Roll on 1d6
Dice	Avg. Dmg.	1	2	3	4	5	6	Notes
	0.1	0.35	0	0	0	0	1	1	1d/5, drop fractions
	0.2	0.7	0	0	1	1	1	1	1d/5, round normally
	0.3	1.05	0	1	1	1	1	2	1d/4, round normally
	0.4	1.4	0	1	1	2	2	3	1d/2, drop fractions
	0.5	1.75	1	1	1	2	2	3	
	0.6	2.1	1	1	2	2	3	3	1d/2, round normally
	0.7	2.45	0	1	2	3	4	5	1d-1
	0.8	2.8	1	2	2	3	4	5	
	0.9	3.15	1	2	2	4	4	6	
	1	3.5	1	2	3	4	5	6	1d6
Implications for Play
Using the “realisitc” scale with ST/10 for swing damage has many repercussions, which must at least be considered before adopting these rules.

Devalued ST
ST is “the attribute that you use to buy damage” in GURPS, with a healthy side-order of “lifting heavy stuff” and “more HP.” The realistic scale requires ST 20 to do 1d thr and 2d sw, and probably calls for a price break. HP are 2 points each; Lifting ST is 3 points per +1 ST, and Striking ST 5 per +1. HP and lifting are as valuable as ever; reducing Striking ST to 2 per +1 ST in realistic campaigns, with overall ST at 7 points per +1 ST, seems appropriate.

Hand Weapon Damage
Weapon damage is lower, and thrust weapons in particular will have limited penetration capability. This takes what was the historically preferred method of punching through heavy armor and nerfs it further. To compensate, add a (2) armor divisor to weapons with a sharp, narrow penetrating surface. Consider optionally allowing a still more impressive construction, buying a fine (hardened) penetrating point that gives a (3) for 4 cost. This would not be available for arrows (see The Deadly Spring, Pyramid #33, for suggestions concerning bows and arrows).

With most hand weapons using the realistic scale, personal armor just got a whole lot more valuable at low DR, especially using the revised armor weights from GURPS Low Tech. This isn’t a bad thing; in fact, it might make a campaign world more closely resemble what we know about our historical real one . . . on didn’t need to lather on 80 lbs. of mail, leather, and plate to protect against basic cuts from swords, or long-range shots from flight or hunting arrows.

Character Differentiation
With thrusting damage at ST/20, and swing at ST/10, there will be very little differentiation between average, fairly strong, and even very strong characters. Weapons rated at sw+2 or sw+3 (maces, axes, and falchions, for example) have their damage almost all defined by the weapon, not the user.
Consider treating the “adds” as an indicator of the power of the lever arm being applied. Treat each +1 as adding +1/3 to a ST multiplier – a sw+2 weapon instead multiplies ST by 1.66. A ST 14 warrior swinging a falchion (sw+2) will do damage as ST 23.2, or 2.3 dice.

One would thrust using the same calculations: a short spear thrust by the same warrior for thr+1 imp would multiply ST by 1.33, for ST 18.6; damage would be ST/20 (2), or 0.9d (2) imp. Note that same spear using the Damage Table (p. B16) would do 1d+1 imp, an average of 4.5 points of penetration. Even the realistic scale here will do 6.3 points, thanks to the armor divisor.

Coup de Grace
The changes to melee damage on the realistic end would bring GURPS damage on the hand-to-hand scale more in line with firearms damage. For a character to do as much damage with a punch as with a 9mm pistol would now require about ST 52 . . . well into supers territory. Even a strong character with ST 20 (1d thr) will be out-penetrated by a .22 LR (1d+1 pi-). For those who want a more realistic scaling for penetration, this may be more satisfying.
The Deadly Spring "...probably the most infamous Pyramid article of all time."-Jeffro's Car Wars Blog
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Last edited by DouglasCole; 09-24-2012 at 05:21 PM.
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