It's a secret society of sorcerers and witches who are continually training new apprentices from our own societies. The lore of the Triangle is simply a spell to hide their island from wandering eyes and those who venture to close.
This post was edited by Benedict Arnold at January 15, 2017 5:49 PM MST
Nothing unusual. It's just a high traffic area of the ocean. Statistically more craft will be lost because there are more of them that could run into trouble.