Supercell is cooking up some surprises for "Clash of Clans" fans in the form of the highly-anticipated September update for the hit mobile game.

The developer revealed on its game's forums that they are working on something called Clan Challenge, which allows players to invite another clan to a "friendly war."

The "Clash of Clans" players who sent the invitation can then set which participants who will join the war and schedule the duration of the preparation as well as the battle days.

The invited party can choose to accept or decline the invitation, and when they do, "preparation day" shall commence. Supercell says that this new "Clash of Clans" feature is different from Clan Wars.

"This feature is not meant to replace Clan Wars (you can't issue a Clan Challenge while there's an ongoing Clan War)," the post read.

"But it will offer better support for events and meet-ups organized by players, as well as other online/offline Community initiatives," Supercell went on to explain.

There's no word as to when this feature goes live in "Clash of Clans," but Supercell emphasizes that it is just "a rough preview of things" and promised to reveal more details at a later date.

As for the "Clash of Clans" September update that everyone is waiting for, there's currently no information as to when it will exactly arrive. With mere days left for this month, it should arrive sooner rather than later.

One of the new features to expect via this update is the ability of players to mine for gems, which could be an alternative for players that will help them save some in-game cash to fund their camps.

While mining gems will be possible after the "Clash of Clans" September update, players should know that it will take time and hard work. Nevertheless, it is a surefire way to get gems without spending much.