[hcobb]

See ITL page 118: "A figure that takes 5 or more hits in one turn has its DX adjusted -2 for its next action (spell, attack, etc.).
A figure that takes 8 or more hits in one turn immediately falls down.
...
Any figure whose ST is reduced to 3 or less has an extra -3 DX for the rest of the combat."

Hits don't reduce your rolls for weapon damage, but hits and fatigue do reduce your sustained effort. For example:

ITL page 71: "However, exhaustion will reduce their ST by 4 each hour. Since tunneling speed is based on a figure’s ST at the moment (affected by any wounds or
exhaustion) this means that the diggers will slow down each hour until they drop."