Red orcs are hostile creatures found in deep caves. They can shoot red bolts at you that do lots of damage. A bow is a good weapon to use, as if your up close, the red bolts can hit you without a chance to dodge. Those bolts pass through walls like the spider worms. They can uncommonly drop rubies, and even more rare a Fire Gland, which is used in the Flame Cannon. They're more rare than green orcs and are found deeper. The bow's a good choice, but the top weapons are:
1. The flamethrower, as it goes through walls and do massive damage bursts.
2. The boomerang, in enough high levers, it will actually do a plenty of damage (and it goes through walls!).
3. Of course, the bow.