Final answer:
Loki transformed himself into a mare and lured the stallion away.
Step-by-step explanation:
In Norse mythology, Loki managed to ensure that the mason did not get his pay by transforming himself into a mare and luring away the stallion Svadilfari. The stallion was crucial in helping the mason complete the wall, so without it, the mason was unable to finish the job within the agreed-upon timeframe.
Learn more about Loki's trick to prevent the mason from getting his pay