Devotion is a project in Civilization VI. It is exclusive to the Heroes & Legends game mode, introduced in the Babylon Pack. It becomes available after building a Monument.
There are 12 types of Devotion project, each corresponding to one of the 12 Heroes in the game. You can only run Devotion projects to Heroes that you have already discovered. Since Sinbad is a naval melee unit, his Devotion project can only be performed in a city with access to water.
The 
Production cost starts at 20 for the first Hero, and increases by 120 for each Hero you own.
Upon completion, it summons the Hero that project is dedicated to, and the city becomes the home city to that Hero. A city can only be home to one Hero.
