async def unban(self, user, *, reason=None):
        """|coro|

        Unbans a user from the guild.

        The user must meet the :class:`abc.Snowflake` abc.

        You must have the :attr:`~Permissions.ban_members` permission to
        do this.

        Parameters
        -----------
        user: :class:`abc.Snowflake`
            The user to unban.
        reason: Optional[:class:`str`]
            The reason for doing this action. Shows up on the audit log.

        Raises
        -------
        Forbidden
            You do not have the proper permissions to unban.
        HTTPException
            Unbanning failed.
        """
        await self._state.http.unban(user.id, self.id, reason=reason)