More Terram Damage

Start from how severe a wound you'd expect it to do on a Size 0 creature and work from there.

  1. I'd expect a Light to Medium wound.
  2. I'd expect a Medium to Heavy wound.
  3. I'd expect at least a Heavy wound, a kill is likely.
    4,5) You're dead.

So, off the top of my head, I'd say 1) +5, 2) +10 to +15, 3) +20 to +25, 4 and 5) don't bother rolling damage.

An other approach would be to try to scale the target up to reduce everything to the first case. How big a giant do you need that a castle would look like a baseball? What's his damage increment?

One magnitude dedicated to a size increase multiplies the size by a factor of 10. The base individual size is in the guidelines for the specific form.