async def request_offline_members(self, *guilds):
        r"""|coro|

        Requests previously offline members from the guild to be filled up
        into the :attr:`Guild.members` cache. This function is usually not
        called. It should only be used if you have the ``fetch_offline_members``
        parameter set to ``False``.

        When the client logs on and connects to the websocket, Discord does
        not provide the library with offline members if the number of members
        in the guild is larger than 250. You can check if a guild is large
        if :attr:`Guild.large` is ``True``.

        Parameters
        -----------
        \*guilds: :class:`Guild`
            An argument list of guilds to request offline members for.

        Raises
        -------
        InvalidArgument
            If any guild is unavailable or not large in the collection.
        """
        if any(not g.large or g.unavailable for g in guilds):
            raise InvalidArgument('An unavailable or non-large guild was passed.')

        _guilds = sorted(guilds, key=lambda g: g.shard_id)
        for shard_id, sub_guilds in itertools.groupby(_guilds, key=lambda g: g.shard_id):
            sub_guilds = list(sub_guilds)
            await self._connection.request_offline_members(sub_guilds, shard_id=shard_id)
r"""|coro|

        Requests previously offline members from the guild to be filled up
        into the :attr:`Guild.members` cache. This function is usually not
        called. It should only be used if you have the ``fetch_offline_members``
        parameter set to ``False``.

        When the client logs on and connects to the websocket, Discord does
        not provide the library with offline members if the number of members
        in the guild is larger than 250. You can check if a guild is large
        if :attr:`Guild.large` is ``True``.

        Parameters
        -----------
        \*guilds: :class:`Guild`
            An argument list of guilds to request offline members for.

        Raises
        -------
        InvalidArgument
            If any guild is unavailable or not large in the collection.