Benten is also known as Benzaiten and her worship travelled from India to Japan with the spread of Buddhism in the 6th Century.
Cassandra Eason's Complete Book of Natural Magick says:
"Benten is eight armed. Six of her hands clasp a sword, a jewel, a bow, an arrow, a wheel and a key. The other two are clasped in prayer. Legend tells how she came to earth to save the children from an evil dragon."
The website www.godchecker.com/ describes her as a goddess of good fortune and says:
"The only Goddess among the Shichi-Fuku-Jin team of Good Luck Gods. Love, sea, music and literature are among her specialities. Ben out of ten for this one."