Arachne Crystal

s are used to summon the Stronger version of Arachne.

Obtaining
The player can obtain a crystal by talking to Shaggy after finding all Relics and Uber Relics and completing both quests while having 3 Arachne Fragments, 8 Enchanted Spider Eyes and 30 Enchanted String in the inventory. This gets you 1.

Arachne has after being summoned with crystals.