From the Super Mario Wiki
Heavenly Light is Palutena's third neutral special move in Super Smash Bros. for Nintendo 3DS / Wii U. The move is based on the power from Kid Icarus: Uprising, and creates a field of light that surrounds an area around Palutena, having the largest range of any attack in the series to date. The light deals continuous damage, but the move does not make opponents flinch. The effect lasts longer if the player holds down the special attack button; it can last up to three seconds.
Heavenly Light also appears as both a power that can be equipped and given as a random event in the Smash Run mode in Super Smash Bros. for Nintendo 3DS, having largely the same effect as Palutena's move.