Final answer:
Frey, a Norse god, is slain by the fire giant Surtr with a fiery sword during Ragnarök after previously giving away his own powerful sword, leaving him with only an antler to defend himself.
Step-by-step explanation:
The death of Frey in Norse mythology occurs during the events of Ragnarök, which is the end of the world and the death of many gods. Frey, who is known for his association with fertility, prosperity, and fair weather, meets a violent end. He is slain by the fire giant Surtr, who wields a fiery sword that brings about destruction. The myth describes how Frey, having previously given away his own powerful sword to his servant Skírnir, is left with only an antler to defend himself against Surtr's overwhelming power. Consequently, Frey is killed in the climactic battle, marking one of the many tragic losses in the prophecy of Ragnarök.