This page contains a list of all the available chat commands and emotes that can be used to add expression to your conversations. Like with all other KI-commands, the chat-commands all start with a forward-slash (/).
There is also a PDF file from Tiran containing most of these commands on a single page:
Besides the commands listed here, you can also select people or groups of people to talk to with your mouse. However, when you are in an Age with a lot of people, the KI will jump to another person than the one you selected from time to time.
Ignoring people is not something I recommend doing. However, there may be situations where it can be useful.
There are a few more commands that are hardly used by most people. These are actually regular KI-commands and are not related to chatting with others. These commands are: '/sendinvite', '/savecolums' and '/loadcolums'.
Emotes are a collection of gestures and actions that you can use in a similar way as that smilies are being used. They can for example emphasize what you are talking about. Each emote has a description at the bottom of the table, showing the emote command followed by the text that is printed on your screen when you use them. In the game, the word 'Player' is replaced by your avatar name.
Minasunda made a video of the emotes, showing exactly what your avatar does when you use them:
Update: The following command was added recently: /retrodance.
Some of the emotes have a keyboard shortcut. They can be called by pressing both the Control-key and a number from 1 to 7..
The feather-commands are a set of commands related to collecting "feathers". Feathers are invisible items that can be found in a number of Ages. Many can be found in Ages that have birds. However, you won't get new Bahro rings on Relto, there's no reward for collecting the feathers.
For many years, 13 was the total number of feathers in Moul(a). Now that new Ages have arrived, new feathers have been added. Currently, there are 17 feathers total in Moul(a).
As for the locations of the feathers, remember that collecting the feathers can only be done in a specific order:
For more info visit the following MystOnline forum topics:
https://mystonline.com/forums/viewtopic.php?t=8164
https://mystonline.com/forums/viewtopic.php?t=21320
https://mystonline.com/forums/viewtopic.php?f=2&t=8118
https://mystonline.com/forums/viewtopic.php?t=11329