[Squirrelloid]

Realistically, Giants wouldn't be able to stand, much less swing a weapon. They should start at 100 fatigue and *slowly suffocate* as their diaphragm is insufficient to lift their ribcage while they lay about like quadrapalegics because their bones are incapable of supporting their mass and their muscles incapable of moving their limbs.

The moment you talk about the realism of fatigue, weapon length, and weapon damage, you have to deal with the some other basic facts of reality. Such as:

-Mass scales with volume (L^3)
-Bone strength scales with cross-sectional area (L^2)
-Muscle strength scales with cross-sectional area (L^2)
-Oxygen penetration/blood distribution scales with L^4/3 (Its, um, complicated and has to do with the mathematics of network distribution systems, but that's the right number).

etc...

So if a giant is a mere 2x as big as a human, he weights 8x as much but only has 4x as much muscle and bone strength. That's a serious issue. (Plus problems with blood pumping, and so on).

If we're going to abjure body scaling, why should we care about realistic fatigue or damage scaling? How would you even calculate these things without having a realistic model for body scaling?

(I mean, fatigue realistically depends on lung capacity, blood throughput (which itself depends on artery/vein size and heart strength), number of capillaries/average distance of capillaries to muscle tissue, Fe/hemoglobin concentration in the blood, muscle energy expended per motion, and so on. All of these things are intimately tied to body scaling.)