Great Hunt works as follows. If it is cast on one animal, two are produced. With more than one animal, the total number of animals is multiplied by 1.75 rounded down, though no more than a total value of 750 food can be created. If huntables and herdables are mixed, they are randomly multiplied by up to 1.75 to make up the Food total.
This god power is best used early in the game to gain a food-gathering advantage over opponents. As it increases the amount of herd animals as well, players may want to move all their herd animals near a pack of wild animals, increasing both their numbers.
Great Hunt only works once on any given animal, so if two allies both worship Odin, they'll have to choose different herds to use their God Power on. This power works well with Poseidon's Lure power, so in a team game is better to use Great Hunt once the lure has attracted several wild animals to multiply the food for both players.