What is "fragarach"

In Irish mythology, Fragarach (or Freagarthach), known as 'The Answerer' or 'The Retaliator', was the sword of Manannan mac Lir and later, Lugh Lamfada.

Forged by the gods, Manannan wielded it as his weapon before passing it on to Lugh (his foster son). It was given to Cúchulainn by Lugh, and later to Conn of the Hundred Battles.

It was said that no one could tell a lie or move, with Fragarach at his or her throat, thus the name 'Answerer'. It was also said to place the wind at the user's command and could cut through any shield or wall, and had a piercing wound from which no man could recover.