fast multi-hit builds (daggers, katanas)
Chain Lightning 15–30% plays best here ; secondary rolls can add Crit Chance or Damage.
Thunder Shard
epic A for weapons Proc
Chance on hit to arc lightning for 15–30% of weapon damage to nearby foes.
Rune stats
- Primary
- Chain Lightning
- Roll range
- 15–30%
- midpoint 22.5%
- Proc chance
- 15.0%
- per hit
- Effect kind
- Proc
- Applies to
- Weapon
- Rarity
- epic
- A tier
True DPS gain at 10x / quality 100
| Weapon | Class | True speed | DPS no rune | DPS +Thunder Shard 22.5% | Gain |
|---|---|---|---|---|---|
| Frostpetal Blade | Katana | 0.94s | 170 | 176 | +3.4% |
| Pocket Shiv | Dagger | 0.62s | 65 | 67 | +3.4% |
| Sakura Worldsplitter | Colossal Sword | 1.755s | 262 | 271 | +3.4% |
Fixed recipe: 10x multiplier, quality 100, no trait ores. Fastest dagger vs mid katana vs heaviest colossal — proc and DoT runes ride the swing rate, so speed classes squeeze the most out of them.
Who should socket Thunder Shard
boss melting stacks that keep procs rolling
Chain Lightning 15–30% plays best here ; secondary rolls can add Crit Chance or Damage.
Frequently asked questions
What does Thunder Shard do in The Forge? ＋
Chance on hit to arc lightning for 15–30% of weapon damage to nearby foes. It sockets into weapons and rolls 15–30% on the Chain Lightning primary stat, with a 15.0% proc chance per hit.
How much DPS does Thunder Shard add? ＋
At the midpoint roll (22.5%), Thunder Shard adds up to 3.4% true DPS on a 10x forge — biggest gains land on Frostpetal Blade. See the sample table for per-weapon math.
What are the best weapons for Thunder Shard? ＋
Socket it on fast multi-hit builds (daggers, katanas) — proc and DoT runes scale with hit rate, so faster weapons squeeze more out of every roll.
Where do you get Thunder Shard? ＋
Thunder Shard is a epic rune (A tier). Secondary rolls can add Crit Chance, Damage, Swiftness — chase a high primary roll first, secondaries are gravy.