Grimoire Cards in Destiny are awards that players earn when they perform certain actions," for example by killing a particular guy or finding a new location. While in Destiny 2 Grimoire Cards will not be uase to tell in-game story.
Destiny 2 is an upcoming online-only multiplayer first-person shooter video game in development by Bungie and in assistance, Vicarious Visions and High Moon Studios.
According to Steve Cotton Forbes, "The answer to that question [about Grimoire Cards returning] is 'no,' and the reason it's 'no' is because we want to put the lore in the game," he said. "We want people to be able to find the lore. All the story is told through the Adventures, it's told through the characters in the world, it's told through the campaign, and it's told through scannables you find throughout the world."
Destiny 2 is set to be released on PC, PlayStation 4, Xbox One after September 8.