Trader Kunai:
On behalf of the Duda-Mara tribe, I thank you! There is much to do...
In order to discover the source of this curse, we require a medium. Once the Kasha Spider was our sacred symbol, and even though it has been corrupted by this fiend, it will still be suitable for our purposes.
Go to the northern region of the Immortal Plateau. There you must slay Kasha Spiders, Kasha Fang Spiders and Kasha Blade Spiders and bring me 30 Contaminated Kasha Spider Venom samples. With them, I will be able to determine the source of this evil.
Naturally, you will be rewarded for your efforts.