Doctor

Healing your target
You can heal all attacks on your target caused by, , the , , a role, , , or the. You cannot heal under certain circumstances: You also cannot prevent anyone from being doused by an.
 * You can heal Bodyguards who die protecting someone. This does not allow them to kill a possible second attacker during the same night.
 * If you heal someone who is visited by a, you will die but your target will remain alive.
 * anyone executed by the or ignited by an ,
 * any suicide (of a, caused by a or by leaving the game),
 * the once they revealed.

Notifications
You will be notified if your target was attacked, including a Vampire bite.
 * You will receive only one notification, no matter how often your target was attacked.
 * Your target will receive a message about being healed. They will not receive additional messages if they were healed by multiple Doctors.
 * You will still receive the message that your target was attacked even if they were protected by a Bodyguard or have Night Immunity.
 * You can heal Escorts, Consorts, and Jailors who role blocked the Serial Killer or Werewolf. However, you will not see that your target was attacked.
 * If someone is successfully healed, their attacker will not get a message of any kind.
 * However, if their target had Night Immunity, the attacker will still get the message saying they are immune.

Strategy

 * Lay low, and avoid revealing your role unless completely necessary. You can use your ability to secretly protect someone from death, while staying under the Mafia's radar. Don't say anything if you healed someone the previous night, and they say something along the lines of "Thanks Doc!" Even whispering to your target, while it might be tempting, can be dangerous, since the Mafia is usually smart enough to kill whoever whispered someone who is being killed; generally, you should only whisper your target if you believe they are a Doctor or Bodyguard and are trying to pair up with them.
 * Keep your self heal for later in the game. There is little chance of the Mafia attacking you early game, especially if you haven't revealed your role. However, as the game goes on, it gradually becomes more necessary to reveal your role. If you have to reveal your role, it is recommended to use your self-heal that night, as the doctor is a nuisance to the Mafia, as well as the Serial Killer.
 * The most important basic strategy for a Doctor is to identify confirmed town members so you can heal them. As an added bonus, anyone who can be publicly identified as Town is more likely to be targeted by the Mafia. When you lack other ideas, people to heal include:
 * Anyone who has voted a Mafia member up to the stand, or who provided decisive evidence to hang a Mafia member.
 * Anyone who has been confirmed via their abilities, such as Vigilantes who put their name in their death note, or anyone brought back by a Retributionist.
 * If someone passes a Spy test, do not blindly heal them as they may be a Blackmailer. Heal them only when confirmed by role filtering or by a Sheriff that they are a genuine Spy.
 * Healing a Jailor allows them to jail any target without fear of the target being the Serial Killer or Werewolf. (However, if the Werewolf attacks the Jailor directly, you will be attacked as well).
 * Two Doctors healing each other are very difficult to kill, requiring either a Witch (redirecting one Doctor's heal elsewhere), a Consort (stopping one Doctor from healing the other), an Arsonist (Burning both without being able to heal each other), a Jester haunt or lynching.
 * If your target was healed, and someone was killed by a bodyguard the next morning, but no Bodyguard died, then you almost certainly healed the Bodyguard. Most of the time, you should immediately whisper to them, claim Doctor, explain what happened, and ask them to cover you for the rest of the game while you heal them. This creates a almost unstoppable team.
 * Healing a Bodyguard allows them to kill anyone who attacks their target, without them dying, until you are killed. This also allows you to indirectly provide indefinite protection to a Mayor, who you cannot heal directly, as long as you yourself are not attacked.
 * A Doctor/Bodyguard pair that are constantly healing/protecting each other is almost impossible to destroy. This is similar to a Doctor / Doctor pair, with the difference that the Bodyguard can kill whoever tries to stop the Doctor. A would-be killer will have a 50-50 chance of either failing to kill or being killed themselves. As long as the Doctor is healing the Bodyguard, the Bodyguard will recover from every successful defense.
 * A Werewolf also can destroy this pair if it targets the Bodyguard, but he will fail to kill and get killed if he targets the Doctor.
 * If a Jailor jails either the Doctor or Bodyguard, the person not jailed will likely be exposed to any attacks. If you self-heal,you can still survive the night unless you were doused and set on fire on the same night or you were role blocked and killed.
 * A Witch or Consort can also break this defense by redirecting or role blocking one of the pair.
 * Transporters can usually confirm by posting a record of who they transported, but healing them after they're confirmed doesn't make as much sense as other confirmed Town members, since they'll usually be using their ability to protect themselves afterwards.
 * You will know if your target is attacked. This can indicate their innocence in a number of ways:
 * If there was no Mafia attack that night, it means your target may have been attacked by the Mafia; aside from rare shenanigans with a Witch, that would mean they're not a member of the Mafia, since the Mafia can't normally attack themselves.
 * If the attack looks like it was from the Werewolf or a Serial Killer, it can indicate that your target wasn't that role (but, of course, they could still be part of the Mafia.) It can be hard to figure out if you've saved your target from becoming a Vampire, but that's also another potential cause for the message (and the messages are indistinguishable.)
 * If you seem to have healed your target from a Werewolf attack, yet survived yourself, this means that they weren't the Werewolf's primary target; in other words, it means they're a visiting role and visited the werewolf's target. If the werewolf's target died to the Mafia or Serial Killer in this situation, and no Mafia killer or Serial Killer came up dead, then it's extremely likely you've actually saved an evil role!
 * If you know who the Veteran is (like if a veteran goes on Alert Night 1 and someone who died from the Veteran was able to record it in their will) it's a good idea to team up with them. You can tell them you're Doctor and that you'll heal them until you die, while in the meantime the Veteran saves their Alerts for later in the game.
 * If someone you were healing dies anyway (and the cause is something you could have healed, not suicide or an arsonist), it means one of three things has happened:
 * First, your target may have been transported. This means that your heal was redirected on to someone else, and the attack was redirected onto your target. Note that this means that your target wasn't the one who the attacker intended to kill. You can try to confirm this by asking if anyone was transported; if anyone speaks up, they were probably the real target of the attack.
 * Finally, if you entered (or changed) your heal command just as the night ended, it may not have reached the server in time.