I really like the idea of Revenant and intends to use one (or more!) to hunt the PCs. The MM says that a Revenant looks superficially like zombie. It is a dead (or undead) rotting body walking around looking for its target wherever the latter goes. The PCs are riding horses, taking boat rides and perhaps using a flying carpet across the world. Assuming the Revenant has no spells to aid itself, how does the Revenant reach the PC within one year before it expires? It walks 30' and cannot fly/swim. People scream and run upon seeing a dead body walking around. It is impossible for the Revenant to take a boat. Even if the boatman has balls of mithril to ferry the walking corpse, the Revenant will still need a silver for the service. Horses will jump when he is near, not to mention getting a ride on it. It's stinking smell will attract unnecessary attention to it. The righteous will pounce on the undead when he strolls the town from one end to another. So, how can the Revenant make its cross-country effectively and fast?