Age of the Gods: Ruler of the Dead Slot by Playtech

Two stacked wilds run this game, and they do opposite jobs. The three-headed Cerberus is the one that pays: land it stacked over a reel and any line it completes gets hit with a random multiplier of 2x, 3x or up to 5x. Since the standard line pays here are on the small side, that multiplier is really where the base-game money comes from, so a tall Cerberus dropped across a live payline is what you're hoping for on every spin. The hooded Charon multiplies nothing. He's the ferryman, and his only purpose is to trigger the Coin Bonus.

Inside that bonus you collect coins in three metals. Gold, silver and bronze land for cash prizes, and the same coins double as your ticket into the jackpots. So the round pays two ways at once: straight cash on the table, plus a shot at the bigger money above it. There's no buy option and no ante bet to force it, so Charon showing up is the only route in.

That bigger money is the four linked progressives shared across the whole Age of the Gods network, from the smallest Power tier up to Ultimate Power. They drop either at random on any paid spin or out of the Coin Bonus, and once you're triggered into the jackpot pick, one of the four is guaranteed. All four sit locked in free play, so you'll only ever see them awarded for real stakes.

The setting is the underworld proper. The reels sit in a black volcanic ravine cut by rivers of glowing lava under a smoky crimson sky. Fur-clad Hercules, a green-robed Persephone in her flower crown and Hades himself fill the premium spots, with a split pomegranate and a plumed bronze war helmet below them, then rough carved-stone 10-through-A royals rounding out the low end.