discord-jeeves/help/adminhelp.md

These commands are very destructive and should be used with care.

!purge <n> Purge messages from current channel.

!purge_from <message.id> Purge all messages after the given <message.id>

!purge_user <user.id> <n> Clear all messages of <user.id> in all channels within the last minutes (n is optional, default 5 minutes)

All purge commands also delete their own message.

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To easily copy IDs of discord items, turn on Developer Mode in Advanced settings in your profile. After this, you can right click on almost all items in discord to get the "Copy ID" option.