"Clash of Clans" Clash of Clans/YouTube China's biggest gaming group Tencent is to buy a majority stake in Finland's Supercell, which makes the 'Clash of the Clans' mobile game, from SoftBank, in a deal valued at roughly $8.6 billion.

The purchase will expand Tencent's interests overseas, as the Chinese video game and social network group still relies mainly on its home market even though it has stakes in various foreign studios like Epic Games and Riot Games.

Tencent will acquire about 84.3 percent of Supercell via a wholly-owned consortium, including all of SoftBank's 72.2 percent stake, it said on Tuesday. The sale is the biggest ever deal in gaming M&A.

The consortium will open up to co-investors, though Tencent expects to maintain a 50 percent voting interest, it said.

Supercell, also creator of 'Boom Beach' and 'Hay Day', has a handful of successful games and gets a significant amount of revenue from in-game purchases, helping it to avoid the problems faced by the likes of rival Rovio Entertainment, which has failed to create a new hit game since its 2009 launch of Angry Birds.

The Finnish company will now receive Tencent's backing as it pushes more aggressively into China's large online gaming market.

With just 180 employees, Supercell had pre-tax profit of 880 million euros with sales of 2.1 billion euros ($2.38 billion) last year, putting the six-year-old firm into the list of largest Finnish companies measured by earnings.

Clash of Clans, the world's No.1 grossing mobile game last year, is a war strategy game in which players build fortresses, form clans and battle it out with other clans in a Medieval-style fantasy world.

Supercell's current management will keep their operational independence and the company will remain in Finland, Tencent's statement said.

For SoftBank, the Tencent deal will mark its third major asset reshuffle in the past month. Softbank is seeking to bolster its finances following its 2013 acquisition of a majority stake in struggling U.S. wireless carrier Sprint.

SoftBank said the latest sale would yield a return of around 2.9 times its original investment. It expects to book a 600 billion yen ($5.74 billion) pre-tax profit this financial year from the sale, it said.

The Japanese media and telecoms company this month said it would sell $10 billion worth of shares in Chinese e-commerce giant Alibaba Group to cut debt, as well as a decision to sell its stake in GungHo Online Entertainment back to the mobile game maker for 73 billion yen.

In a surprise move, SoftBank said on Tuesday President Nikesh Arora would resign as of its Wednesday shareholder meeting, less than two years since he joined the group.

Tencent said it expected the Supercell deal to close in the third quarter of 2016. The Chinese company made 32 billion yuan ($4.86 billion) revenues in the first three months of 2016, of which over half came from gaming.

(Reporting by Paul Carsten; Additional reporting by Jussi Rosendahl in Helsinki; Editing by Muralikumar Anantharaman and Jane Merriman)