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How to Beat Voltvyrm Boss

Voltvyrm is a strange, optional boss in Hollow Knight: Silksong, found clinging to the ceiling of a hidden sub-area called the Voltnest within the Sands of Karak. Resembling a pile of pink, crackling barnacles or a coiled nest of charged worms, this boss is less of a bug and more of a living electrical hazard. The entire fight is a test of spatial awareness and patience, requiring you to navigate an arena filled with telegraphed electrical attacks while striking a single, moving weak spot.

How to Find Voltvyrm

The Voltnest is a hidden area high up in the Sands of Karak. Although it’s an Act 2 boss, the path can be tricky, but you don’t need late-game abilities to reach it.

Start from the Sands of Karak Bench (Coral Tower) and head right. In the long vertical room before the exit, you need to reach a hidden opening on the upper right wall. While the Silk Soar (High Jump) ability makes this trivial, you can reach it much earlier. To do this, climb the left wall as high as you can, then jump towards the right wall and use a combination of the Clawline and a Double Jump to get into the opening. Once inside, pogo over some spikes and climb the final wall to enter the Voltnest. The boss is at the end of this path.

Build & Preparation

The fight takes place in a relatively tight space with constant area-of-effect (AoE) attacks, making healing difficult. This build focuses on survivability and maximizing damage during the short, safe windows.

An excellent AoE ability for tight spaces. It allows you to deal damage to the weak spot even when it’s not directly above you.

The wider crescent slashes from your nail make it much easier to land upward strikes on the moving weak spot.

A great way to boost your damage. Imbuing your nail with fire helps you make the most of the short attack windows.

Almost essential for this fight. The constant AoE attacks leave few safe healing opportunities. Warding Bell shields you while you bind, giving you a chance to recover.

How to Beat Voltvyrm

This fight is about pattern recognition and precise movement. Stay calm, watch the telegraphs, and don’t get greedy.

Identify the Weak Spot You cannot damage the entire Voltvyrm mass. Your target is the small cluster of barnacles that constantly moves around within the main body. Focus all your upward attacks on this single point.
Beware the Electrified Ceiling When Voltvyrm is pulsing with electricity, its tentacles will light up. During this time, the entire ceiling is electrified. Do not jump too high or touch any part of the ceiling, or you will take damage.
Dodge Towards Danger This is the most important survival trick for the Shock Pillars. They typically move from one side to the other. Your instinct will be to run away from them, but this will corner you. Instead, as soon as a pillar fades, dash towards where it just was. This gives you the maximum amount of space to dodge the next ones.
Attack While It Charges The best time to attack is right before Voltvyrm unleashes one of its electrical patterns. There is a brief window where the weak spot will pause and charge up. Use this moment for a few safe upward slashes.

Attack Patterns & Counters

Voltvyrm only has two main attacks, but it uses them to fill the arena with hazards. Watch for the glowing telegraphs.

Shock Pillars

Ranged / AoE

A cluster of barnacles emerges, channeling energy to summon sequential pillars of pink electricity. These pillars typically appear one after another, sweeping across the arena.

Counter: Do not run away from the pattern. As soon as the first pillar fades, dash into the now-safe space it occupied. Repeat this, following the pattern across the room, to avoid being cornered.

Static Burst

Ranged / AoE

Multiple glowing pink spheres of static energy appear around the arena, marking where bursts of electricity will erupt. The pattern can change; sometimes they cover the floor, forcing you to jump.

Counter: Quickly identify the safe gaps between the glowing spheres and position yourself there. If they all appear on the floor, a simple jump is enough to keep you safe. Punish the weak spot as soon as the attack ends.

Rewards

Defeating this optional boss rewards you with a powerful tool that enhances your abilities.

Volt Filament: You will obtain the Volt Filament. This tool can be equipped in a Crest slot to add electric damage to Hornet’s Silk Skills.