Bandits are made up of a wide variety of individuals, ranging from lowlife thugs to ex-adventurers and soldiers. They are pretty common sight and will never hesitate to cut your throat out. They wield a variety of weapons and will always attack you on sight.
Goblins are a small warlike humanoid race that lives off of attacking the weak and defenseless, not much of a threat to experienced adventurers, be weary of them attacking in large numbers.
Orcs are a brutish race that live for battle. They are tough and hit hard, although they are not very bright.
Trolls are large race of huminoids that make orcs seem like engineers, although they have a low intelligence, their incredible strength and hunger for human flesh makes them a very deadly adversary.