A Storm Werewolf build usually takes Storm Strike from Nfkjasfas's blog

A Storm Werewolf build usually takes Storm Strike as its chosen basic attack for its ability to apply the Vulnerable status effect Diablo 2 Resurrected Items. The Greastone of the Crone unique Two-Handed staff transforms Claw into a Storm skill while simultaneously casting Storm Strike for greater damage. This is an interesting trade-off as you're moving away from Storm Strike's accessible Vulnerable procs for Claw's attack speed, favoring more raw damage.

Greatstaff of the Crone also rolls with additional damage to controlled enemies, more non-physical damage, damage to close enemies, and ranks to Claw. The weapon is the foundation for a hard-hitting Storm Werewolf build, but the simple improvement is a tad bit underwhelming for a unique weapon.

Lightning and Werewolf skills are a match made in heaven to destroy hordes of demons. Tempest Roar, a unique helm, acts as the unbreakable bond to the productive relationship. Equipping it makes your Storm skills count as Werewolf skills, benefitting from passives and buffs for the keyword. Additionally, Storm skills have a chance to grant extra Spirit.

Tempest Roar enables a hyper-aggressive build where you'll soften up enemies by applying Vulnerable, then stacking on Poison and AoE attacks buy D2R ladder items. Lightning's damage also receives a much-needed boost to their direct damage from Werewolf passives like Lupine Ferocity and Toxic Claws.