Retreat! Many monsters will route when things start looking bad for them. "Looking bad" is a subjective call by the DM based on the situation and the monster's psychology, but as a baseline, intelligent foes retreat when they are at half strength, unless the party is also down to half strength. Sometimes if things look really, really bad, the monsters will even surrender. Of course, the party gets full XP for monsters that retreat or surrender, and some monsters (such as undead and constructs and creatures guarding their young) will fight to the death.
This serves several purposes:
1. We skip the last few "mop-up" rounds of combat, which are usually pretty boring, tedious, and without suspense.
2. It presents a world in which intelligent creatures actually make decisions and are not mindless video-game enemies.
3. It subtly encourages the PCs to retreat or surrender when they face an overwhelming force.
This serves several purposes:
1. We skip the last few "mop-up" rounds of combat, which are usually pretty boring, tedious, and without suspense.
2. It presents a world in which intelligent creatures actually make decisions and are not mindless video-game enemies.
3. It subtly encourages the PCs to retreat or surrender when they face an overwhelming force.