A gambling game created to be used inside of fantasy role playing games as a plot hook, but it can also be played as a stand alone game. Players roll custom metal dice with special symbols replacing the 1's. Depending on the roll, they might pay into the pot, take from the pot, or be eliminated entirely. The last player in the game takes the entire pot.
From the rulebook:
Tyr's Treasure is a game of chance for use with any Role-Playing System. The rules are designed for 1-6 players. The game is played with two handmade brass six-sided dice that are cast across your favorite tavern table.
Some like knuckle bones, Troll's Teeth, or Dragon Scales, and the Coastal folk prefer Golem's Gambit, but warriors abroad love the chance and excitement of Tyr's Treasure.