Kill them all!
Henzell says...
  1. Approximately: 1d(base*strength_bonus)*skill_bonus + random2(to_dam + slaying + 1) + various bonuses. Weapon {brand} is applied after monster AC reduction.
  2. Strength bonus is usually < 1.5 (see {str}), {skill bonus} (both from weapon and Fighting skills) is randomized, averaging about 2.0 at max skill
  3. Damage bonuses include +1d10 for {might} and -1d5 when Starving.
  4. You can get walked through the calculation in more detail (as of mid 2017), together with a couple of ASCII graphs and some summarizing remarks, here 'https://crawl.develz.org/tavern/viewtopic.php?f=5&t=23662&p=313558#p313558 '
  5. Weapon damage calculator: 'http://www.dcssfamiliar.com/#/'

Information based on master branch and the great LearnDB.
© Dungeon Crawl Stone Soup, 2010.