ZERO Sievert presents [b]The Rotking Update[/b]

[i]Face the Rotking. Master the Chemicals. Survive the Zone.[/i]

This update brings some of the biggest additions yet to [b]ZERO Sievert[/b] — new bosses, enemies, factions, perks, and gear — alongside dozens of quality-of-life improvements and fixes.

Face off against the [b]Rotking[/b], uncover [b]chemical secrets[/b] beneath the Swamp, and encounter a new [b]Industrial Faction[/b] with powerful, unique equipment.

All that, plus new ammunition types, perks, and smarter UI and sound systems make this update one of the most feature-packed yet.

Let’s dive in. [dynamiclink href="https://youtu.be/-HZ62x4tDAs"][/dynamiclink]

???? NEW MUTANTS & BOSSES

???? [b]Rotfang[/b]

A new threat stalks the Zone. The Rotfang is a twisted mutant born from chemical corruption, bringing new challenges to deep-zone expeditions.

???? [b]Rotking[/b]

A terrifying new boss emerges from the sewers:

• Wields a [b]unique weapon and armor[/b], both infused with chemical properties.

• [b]Armor Passive Effect:[/b] Standing on chemical anomalies restores HP.

• Pairs perfectly with the new [b]Chemical Grenade[/b], offering deadly combat synergies.

???? NEW WEAPONRY & GEAR

???? [b]Chemical Grenade[/b]

A deadly new tool of chaos. On impact, it spawns [b]temporary chemical anomalies[/b] on the ground, dealing area damage over time and opening up creative tactical options.

???? [b]Rotking’s Loot & Questline[/b]

After completing [b]“The Crystal”[/b], a new quest — [b]“Chemical Documents”[/b] — sends you back into the sewers to confront the Rotking. Defeat him and recover critical intel to [b]unlock the crafting recipe for Chemical Grenades.[/b]

⚙️ NEW FACTION: [b]THE INDUSTRIALS[/b]

A powerful new [b]end-game faction[/b] has appeared in the [b]Industrial Area[/b], unlocked after completing [b]“The Bridge to Zakov.”[/b] Speak to the [b]Barman[/b] and select the new dialogue option, [i]“Any news?”[/i], to begin your involvement.

Faction Gear

• [b]Standard Faction Armor:[/b] 15% chance to deflect bullets — includes VFX and SFX.

• [b]Boss Armor:[/b] Deflected bullets heal [b]25% of their damage[/b] back to the wearer.

• [b]Unique Boss Weapon:[/b] A one-of-a-kind firearm wielded by the faction leader.

???? NEW AMMUNITION TYPES

• [b]5.45x39mm BP[/b] – Craftable, high-penetration rounds.

• [b]5.45x39mm Horizon[/b] – Exclusive to the new Horizon Boss.

• [b]7.62x25mm Chemical[/b] – Craftable after completing [i]“Chemical Documents.”[/i] Dropped only by the Rotking.

???? NEW PERKS & BALANCE CHANGES

[b]New Perks[/b]

• [b]Rolling Start (Pistols, SMGs, Shotguns):[/b] After standing still for 1 second, gain [b]+30% movement speed[/b] for 2 seconds.

• [b]Point Blank (Pistols, SMGs, Shotguns):[/b] Shots inside effective range have a [b]+20% armor penetration chance[/b] on full hits.

• [b]Sticky Fingers (Hunter):[/b] Find [b]5x more Roubles[/b] in loot.

[b]Updated Perks[/b]

• [b]Grenade Expert:[/b] Now grants [b]immunity to flash grenades[/b] and [b]your own grenades.[/b]

• [b]Phantom Bullets (SMGs):[/b] Level requirement reduced from [b]15 → 11.[/b]

• [b]Point Blank:[/b] Adjusted behavior — now triggers on [b]full hits[/b] instead of crosshair color indicator.

???? QUALITY OF LIFE IMPROVEMENTS

• [b]Ear Ring Volume Slider:[/b] Control the volume of grenade ringing effects separately.

• [b]Ammo Type Indicator:[/b] Easily see which ammo type your weapon is currently using.

• [b]Improved Item Tooltip:[/b] Now shows how many of that item you own in your [b]bunker stash.[/b]

• [b]ESC Key Behavior:[/b] Consistently returns to the previous menu when navigating settings.

• [b]UI for Active Injectors:[/b] Cleaner, clearer visualization of currently active injectors.

• [b]Rain Sound Fix:[/b] Rain audio now correctly stops when the player moves indoors.

• [b]New Achievement:[/b] Steam achievement for completing the [b]tutorial[/b] (unlocks automatically when

  the extraction countdown reaches 0).

????️ QUESTS & WORLD CHANGES

• [b]New Quest – “Chemical Documents”:[/b] Introduces the Rotking boss and Chemical Grenade crafting.

• [b]New Quest – “Base Building”:[/b] Unlocks after [i]“Valuable Item.”[/i] Tasked with constructing your first base module.

• [b]Swamp Sewer Rework:[/b] Major layout and lighting improvements for smoother navigation and stronger atmosphere.

• [b]New Extraction Point:[/b] Added a new extraction zone in the [b]south-west area of the sewer.[/b]

???? FIXES & ADJUSTMENTS

• Fixed barman text [i]“Any news?”[/i] not displaying correctly.

• Fixed crash on [b]chemical anomaly[/b] interactions.

• Fixed solid wall misalignment during the [i]“Machinery”[/i] quest.

• Fixed crash caused by player’s own [b]flashbang.[/b]

• [b]Grenade Expert[/b] perk flashbang immunity now works correctly.

• [b]Shotgun Slug[/b] ammo no longer has a minimum effective range limit.

• Fixed [b]lighting issues[/b] in the sewer.

• Fixed [b]dialogue display issues[/b] after [i]“Revelations.”[/i]

• [b]TSU Scope[/b] can now be mounted on the [b]Wintar BK.[/b]

????️ LOCALIZATION

• General localization fixes and improvements across menus, quests, and tooltips.

As always, your feedback helps shape [b]ZERO Sievert[/b]. Keep sharing your thoughts, builds, and stories with us — and we’ll see you in the Zone.

[b]– The ZERO Sievert Dev Team[/b]