I really admire Fuleyla's creativity. These Sonic Pills are a real stroke of genius, mused Joe.
Go to the entrance of the spiders' cave to the west of Whitewolf Castle and swallow this Sonic Pill. Shout at the entrance, and creatures will respond.
Kill the creepy crawlies, then report to Fuleyla.
According to my investigation, they call the night widow spider in the western spider nest Domelina; she became huge and bloated under the influence of the black power.
Once Domelina dies, the spiders will stop multiplying so quickly.