Demon Crab and the Mushrooms
... The only danger was the ocean, which, every once in a while, produced a gigantic crab like demon that would come on land from the eastern shore and attack the towns. ... The humans tried many times to destroy the demon but when it got close to death it would scamper back into the ocean, and would be fully healed the next day! ... He told the human clans “Make it so there are five full baskets of mushrooms near to the eastern shore tomorrow!” and so all the clans started collecting mushrooms from all over the continent, until they filled the baskets, then they gathered at the eastern shore of Pangaea.