Kill them all!
Henzell says...
  1. Stats can be temporarily reduced by various effects and restored gradually by gaining XP. If a stat reaches 0 you are immediately paralysed for 2-4 turns, you are slowed, and have other nasty effects depending on the stat (see {stat drain[2]}. These effects persist for a short time after the stat recovers.
  2. 0 str: Collapse: No regen with monsters in {los}. 0 int: Brainless: Can't memorize or cast spells or read scrolls. 0 dex: Clumsy: 0 stealth, minimal evasion, can't stab, can't block. All three effects slow you (doesn't stack).
  3. Maximum drain from one source: 7 (necromancy miscasts, including {mummy} death curses, Zot traps, and Hell effects), 6 (divination miscasts, including {ocs} and {sif muna wrath}), 6 (cursed rings and randarts), 4 (degeneration)
  4. Prior to 0.28, 0 str gave 1/4 regen instead of no regen in LOS of monsters, and 0 int instead gave 80% to failure to reading scrolls instead of -Scrolls. Prior to 0.17, additional stat drain while already at zero caused 5 + random2(maxhp/10) irresistible damage.

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