Stormspike is a unique Stiletto from Diablo II: Lord of Destruction.
As its name implies, Stormspike adds not only a large amount of Lightning Damage to attacks, but also boosts Lightning Resist to higher numbers at higher character levels. Still, Stormspike is lacking in damage compared to other weapons, and its defensive bonuses are often outdone.
Stats[]

Stormspike
Stiletto
One-Hand Damage: 47 To 90
Required Level 41
Required Strength: 47
Required Dexterity: 97
Durability: 24
Dagger Class – Fast Attack Speed
+150% Enhanced Damage
Adds 1-120 Lightning Damage
25% Chance To Cast Level 3 Charged Bolt When Struck
Lightning Resist + (1 Per Character Level) 1-99 % (Based On Character Level)
Attacker Takes Lightning Damage of 20
Normal Daggers — Gull (Dagger) • The Diggler (Dirk) • The Jade Tan Do (Kris) • Spectral Shard (Blade)
Exceptional Daggers — Spineripper (Poignard) • Heart Carver (Rondel) • Blackbog's Sharp (Cinquedeas) • Stormspike (Stiletto)
Elite Daggers — Wizardspike (Bone Knife) • Fleshripper (Fanged Knife) • Ghostflame (Legend Spike)
Quest Items — The Gidbinn