He can move no faster than 1/3 his normal movement rate when moving silently.
He can't be observed when attempting to use this ability (moving silently isn't of much use to a ranger who's being watched).
If he draws attention to himself either intentionally (speaking) or inadvertently (sneezing), the effects of moving silently are immediately negated.
The DM rolls percentile dice as soon as the ranger makes an attempt to move silently. If the roll exceeds the ranger's move silently score, he is as likely to be heard as any other character moving in the same terrain; snapping a twig or kicking a pebble may draw the attention of NPCs or creatures.
If the roll is less than or equal to the ranger's move silently score, he is able to move without sound. He continues to move silently until the terrain changes (for instance, if he enters an area of pebbles, shallow water, or dried leaves), or he attempts a new action that affects his ease of movement (such as carrying an unconscious companion or a large jug of sloshing water). Any such change requires a new roll.
Every ranger has a particular creature for which he harbors a deep loathing. Even an otherwise pacifistic ranger has no reservations about harming this creature. In fact, he
may actively seek it out for the express purpose of destroying it. The creature that a ranger opposes above all others is called his
ranger gains special combat modifiers when encountering his species enemy, reflecting both his knowledge of the creature and his intense emotions.
The player must choose his ranger's species enemy before the character advances to 2nd level. The DM has final approval of the choice. Once the species enemy is determined, it never changes; the ranger retains the same species enemy for the duration of his career.
Though it's not required, the DM may wish to suggest or assign a species enemy based on the ranger's personal history. Conversely, the player may use a DM's choice of a species enemy to fill in some details about the character's early life. Here are a few ways a species enemy might reflect a ranger's background:
The species enemy was responsible for a personal tragedy in the ranger's youth. The enemy may have killed a ranger's friend or sibling, or may have destroyed the ranger's village and everyone in it. The ranger has vowed to avenge himself against the hated creature.
The ranger had an intense phobic reaction against a particular creature, perhaps as a result of a childhood trauma. When the ranger was an infant, for example, a snake may have slithered into his crib and tried to swallow him. After years of struggle, the ranger eventually overcame his phobia. In the process, the creature became his species enemy.
A lord or king hired the ranger as a young man to rid the region of a particular creature. What began as a job became a personal vendetta, and the ranger has come to regard the creature as his species enemy.
To determine a ranger's species enemy, consult Tables 20-29, rolling on the table corresponding to the ranger's primary terrain. The DM isn't confined to the