What is vex mythoclast drop rate?

As an AI language model, I don't have access to the latest information about Vex Mythoclast drop rates. However, here's what I can provide:

• Vex Mythoclast is a powerful exotic fusion rifle that was first introduced in Destiny 1.
• It was recently brought back in Destiny 2 through the Vault of Glass raid for Season of the Splicer.
• The Vex Mythoclast is a rare drop from the final encounter of the Vault of Glass raid, Atheon.
• The drop rate for Vex Mythoclast is unknown, but it is usually considered a low probability drop due to its exotic rarity and the difficulty of completing the raid encounter.
• Players can increase their chances of getting a Vex Mythoclast by completing Atheon's challenge mode and opening the secret chest that appears afterward.
• Some players may also have luck with RNG (random number generator) drops or by completing the raid encounter multiple times. However, these methods are not guaranteed.