A special message that appears in a channel when it begins following an announcements channel.

A message in a channel that denotes a message was pinned.

A default message. Contains text and/or embeds sent by a user, bot, or webhook.

A special message that appears in the system channel that a guild member has joined the server.

A default message that includes a reference to a message.

A special message that appears in the system channel when a member boosts a server.

A special message that appears in the system channel when a guild is boosted to tier 1.

A special message that appears in the system channel when a guild is boosted to tier 2.

A special message that appears in the system channel when a guild is boosted to tier 3.