Forgotten Gods
From Irish Celtic Mythology:

Scáthach, “The Shadowy One”, was a mythical Celtic warrior and martial arts trainer. She was an incredible trainer and her school of warriors turned out some of the top Celtic heroes including Cú Chulainn, the hero of the Ulster Cycle.
To get to her training fortress, first, one has to cross the Plain of Ill-Luck and the Glen of Peril. Then one has to cross the “Bridge of Leaping”; as one sets foot on it, the end swings up and flings them back where they came from.

At this nigh-impregnable castle, she trained heroes in the arts of pole vaulting, underwater fighting, and combat with the Gáe Bolg, a barbed harpoon of her own invention.

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