by the Riders that only damage the hero, not other monsters.
Noticed and diagnosed by vultur-cadens. Attacks dishing out the
damage type AD_DETH (Death), AD_FAMN (Famine), AD_PEST (Pestilence),
and also AD_DISE (Demogorgon, Juiblex, Scorpius) did 0 damage if
inflicted against monsters. That made Death harmless to other
monsters. The others have additional attacks (in the two Rider's
cases, only if both instances of their special attack hit on the
same move so that the second one is converted into a stun attack)
and could manage to kill other monsters.
The uhitm case can't happen. I suspect that the mhitm case was
originally intentionally omitted as something which won't happen,
but that's just a guess.
Fixes#594
017a8687e0