diaglo
Adventurer
Actually, that has to be 2E, because it's the only edition that explicitly listed a -10 hp rule as Optional. (1E had a -10 hp rule, non-optional, but triggered only if you actually hit 0 hp on the dot. With option listed to lower "trigger spot" down to -3 hp.)
It looks like they're advancing editions over time in the heavens.
who said it was listed? everything is optional if it is not listed.
OD&D(1974) is the only true edition. Rich knows that.