Circa 1992.

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Ninja guild is not very well known. Ninjas hide their guild-areas
very well and only high level ninjas can enter them. Ninjas take new
apprentices by inviting them to guild. This can be done by ninjas
whose level >= 15, but in order to respect ancient rules, they aren't
allowed to invite very low level characters (<3). Ninjas are famous
for their combat skills and stealth. No good player may stay as a ninja.

  ninja enter  - Entering the guildroom (from adv guild only, level >3 only)
  ninja tell   - Cooler tell (doesn't work to wizards)
  ninja greet  - Greet a player
  ninja walk   - Show some tricks
  ninja cool   - Be so cool
  ninja invite - Invite person to guild. This secret ritual
                 must be performed in a room there isn't any
                 outsiders. Cost is 5000 coins, inviter gets 2000 coins.