Diablo series has been developing these mechanics

Dissidia, Final Fantasy Opera Omnia's equipment or characters from cheap Diablo IV Gold the enduringly popular Fate/Grand Order or Genshin Impact games. In the case of Diablo Immortal, it is using Legendary Crests, which can be earned or purchased, to increase the likelihood of a 5-star gem appearing in dungeons at the end of the game. 

Players are still engaging with the kind of randomness in a similar way, despite the fact that its presentation is not entirely traditional (the majority of gacha are performed by "rolling" on a banner that is only available for a limited time). 

As Maddy Myers wrote a few weeks ago, the Diablo series has been developing these mechanics in many ways since its inception. Diablo Immortal also clearly draws direct inspiration from a "feeding" mechanic that has been commonplace in numerous mobile games from China, Korea, and Japan for more than a decade. 

Obtaining a duplicate of a drop is known as "feeding," and it involves increasing an item's stats, attributes, or rarity. After that, these duplicates are fed to an item of the same rarity to boost its overall stats. The industry standard for maxing out an item or character is five copies.

Fate/Grand Order, which was Diablo 4 Gold first released in Japan in July 2015 and made $4 billion worldwide in 2019, was my first introduction to "feeding." I needed to get copies of each character in order to make them the best they could be.