https://www.polygon.com/2018/7/16/17577032/final-fantasy-14-monster-hunter-world-crossover-event-dates

Capcom and Square Enix are bringing the worlds of Final Fantasy 14 and Monster Hunter: World together this summer, with monsters, characters and items crossing over between games. Last week, Capcom detailed when and how Final Fantasy will come to the latest entry in the Monster Hunter franchise — now it’s Square Enix’s turn.

Final Fantasy 14: Stormblood players will get access to Monster Hunter: World-inspired content on Aug. 7, when the legendary monster Rathalos invades the Final Fantasy MMO. Players will be able to take on Rathalos in a trial named “The Great Hunt,” which will come in normal (for up to eight players) and extreme (just four players) versions.