Covington & Burling and Slaughter and May are advising Chinese technology company Tencent Holdings Ltd. on an $8.6 billion acquisition of a majority stake in the Finnish game developer behind the Clash of Clans mobile game.

Shenzhen-based Tencent is leading a consortium to buy an 84.3 percent stake in game developer Supercell Oy from Japan’s SoftBank Group Corp. and the game maker’s employees. The deal, Tencent’s largest-ever acquisition, values Supercell at $10.2 billion.