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Knockdown Rules (Advanced)

By: Thoth / Splynn (thoth@netside.com)
With tweaks and extra parts by: Dustin M. Ramsey (DustinM@rifts-rpg.com)


These advanced rules can be used to very realistically determine Knockdown (KD) and Knockback (KB).

 

Effects of a Knockdown

Knockdown:

the target's initiative is reduced to zero, and they loose one attack per melee

Knockback:

target is knocked back 1 inch per 1% chance of their knockdown

First, take the amount of damage and multiply it by 1000 (or by 10 if it is S.D.C. damage), then multiply the result by any applicable Damage Type Modifiers and Target Modifiers. The target's chance of being knocked down (known as the KD%) is equal to this number divided by their weight.

For every whole 100% in the target's KD%, the target automatically looses one attack per melee. Example: TargetA has a 450% chance of KD. This means that TargetA loses 4 attack without question, and has a 50% of losing another.

Any time a target takes damage, Knockback (KB) always occurs, but may mean nothing more than a step back and no loss of attacks. Distance of KB is equal to one inch per one percent of the target's KD%.

Damage Type Modifiers:

  • Punch/Physical Attack: x1.25 from supernaturally strong; no modifier from normal or robotic strength
  • Explosion: x4 if hit directly; x2 if within blast radius
  • Rail Gun/Auto Cannon: x1.25
  • Particle and Ion: x.75
  • Plasma: x1.1
  • Laser: x.1

Target Modifiers:

  • Hit Head: x2
  • Leg Hit: x1, but if target is not knocked down, they must roll against PP or fall (-1 attack)
  • Back of Knee (from behind): x1.5, but if target isn't knocked down roll against PP at -1D6 or fall (-1 attack)
  • Target has High Center of Gravity : x1.5 to x2
  • Target has Low Center of Gravity : x0.5 to x0.75

Example 1: TargetB gets hit with a 35 MD punch. 35 x 1000 = 35000. TargetB weighs 200lbs. 35000/200 = 175%. Which means 1 attack is automatically lost, and there is a 75% chance of losing 2 attacks. Additionally, TargetA suffers a KB of 175 inches (14.6 feet)!

Example 2: TargetC is in the blast radius of a fragmentation grenade and takes 3 MD. 3 x 1000 x 2 = 6000. TargetC weighs 150lbs. 6000/100 = 40%. This means that TargetC has a 40% chance of losing 1 attack. Regardless of if they are knocked down, TargetC is displaced 3.3 feet.

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