Throughout Death’s journey, players will be able to find Boatman’s Coins. Floating diamond-shaped coins with a green glow. These can be traded to Vulgrim in various amounts for chests containing randomised loot of varying quality.
There are 100 Boatman’s Coins scattered throughout the four realms Death visits on his travels. Unlike the rest of the collectibles in the game, the Boatman’s Coins are not linked to any achievements/trophies or side-quests, so collecting them is either a pursuit for completionists or perhaps for trying to get some beasty gear from Vulgrim.