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Logarithmic GURPS Damage System (LGDS)

By Anthony Jackson (ajackson@iii.com)

For a 'realistic' game, weapons which do 6dx100 are fine. For a more cinematic game, you may want things to work differently. LGDS treats all damage as being logarithmic. When converting gadgets, vehicles, animals, and the like, use the conversion below (characters are converted differently). DR/T is DR + sqrt(hit points), and is 3 for a typical human (use 3 for ultra-tech equipment).

Old Damage 1d 1d+1 1d+2 2d 2d+2 3d+1 4d 5d 6d 8d 10d
New Damage 1d 1d+1 1d+2 2d-1 2d 2d+1 2d+2 3d-1 3d 3d+1 3d+2
Old Damage 13d 16d 20d 25d 32d 40d 50d 63d 80d 100d x100
New Damage 4d-1 4d 4d+1 4d+2 5d-1 5d 5d+1 5d+2 6d-1 6d +5d

Old ST 10 13 16 20 25 32 40 50 63 80 x10
New ST 10 11 12 13 14 15 16 17 18 19 +10
Old DR/T 3 4 5 6 8 10 13 16 20 25 x10
New DR 0 1 2 3 4 5 6 7 8 9 +10

When converting characters, do not use this system. Character conversion is instead done as follows:

Magic Do not convert. Listed effects are fine.
Fantasy/Medieval Equipment Do not convert.
Super-ST For ST up to 30, do not convert. For ST greater than 30, change to 27 + ST/10 (i.e. cost of +1 ST is a flat 5/level)
Super-DR Divide by 4
Super-Atk Divide dice by 4. 1/4d = +1, 1/2d = +2, 3/4d = +1d-1

Some more convenient rules of thumb:

For objects, figure out the stats of a size-0 object (using the DR/T formula above), and add +2 DR per +1 size modifier. A typical size-0 boulder has DR 8 and HT 10, a size-0 statue has DR 4 and HT 10.

For lifting objects, figure out the ST required to lift a size-0 object, and add +5 ST per +1 size. A typical size-0 boulder requires ST 18. With +1 ST, you can carry it as extra-heavy load, with +3 ST as heavy load, with +6 ST as medium load (or lift one-handed), with +8 ST as light load, with +11 ST as no encumbrance.