I was researching just this topic over the summer, as I came across the picture of the Indian guy with two 6-bladed whip swords standing upon a rock and was mightily intrigued. Looking at the urumi demonstrations on You Tube, I saw that there were two main types of whip swords, multibladed and single, and read about hwo they were "traditional" weapons to a region in India.
They aren't very traditional, as the springy, high-quality steel that is needed to make them only dates to the 18th century. But yeah, they were used to fend off groups of 0-level types by Raj bodyguards, etc. Wrapped around the waist, like a belt, they could be pulled out fairly quickly. The multi-bladed ones generally only went up to 2 or 3 blades, not the 6-bladed ones that are seen in the iconic photo (cool as fuck photo, by the way.) The Spanish came up with rapier versions during the 18th century, which is why I knew what it was...also why it has the snake motif.
photo in wikipedia article:
https://en.wikipedia.org/wiki/Urumi
Here's my write-up for the whip swords used in my Erelhei-Ciinlu expansion (Nestesedi-Dycion). They are indeed used to distract mages!
Whip Sword (Mage’s Bane)
Found in any sizable band of dokkalfar will be several male fighters of levels 4+ whose job it is to penetrate an enemy’s ranks and directly engage spellcasters. These fighters are equipped with whip swords specifically designed to strike opponents at twice their normal rate if used in a paired, two-handed fighting style. With a certain number of flexible, 6-foot blades, whip swords mete damage to unarmored opponents equal to the die that corresponds to the number of blades/tines employed (d4, d6, etc.). To ar-mored opponents the swords deal half as much damage, rounded up. Fabricated from relatively cheap materials, whip swords nev-er have magical bonuses exceeding +1.
The number of blades a fighter may employ on each of his whip swords depends upon his character level, with 4th and 5th level fighters able to employ 4-bladed whip swords, 6th and 7th level fighters capable of using 6-bladed weapons, and so forth. Thus, while all fighters employing these weapons attack at twice their normal rate, 5th level fighters would only be able to strike un-armored targets for d4 damage per hit while 8th level fighters could hit for d8.
Although dokkalfr deride whip swords as ineffective weapons fit only for certain subordinate males, the weapons do have an addi-tional feature: dual whip sword users may deflect a percentage of small projectile missiles (darts, bolts, arrows, javelins) fired at them from their forward-facing directions (i.e., that they are aware of). The percentage of missiles capable of being deflected is equal to 5% times the number of blades one of the user’s whip swords: 20% for 4-bladed, 30% for 6-bladed, etc.