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Production-ready status effects for multiplayer - buffs, debuffs, DoTs, stacking, immunity, and interactions. One component, zero GAS dependency.

Built for Unreal Engine 5 with server-authoritative replication, FastArray delta updates, late-join support, data-driven effect definitions, five stacking policies, tag-based immunity and interactions, and a full Blueprint API. Includes 30+ example effects, an interactive demo map, buff bar UI, and complete documentation.

The Problem

Every multiplayer game needs status effects - poison, burning, shields, speed buffs, stuns, heals over time. Building a replicated buff/debuff system from scratch means weeks of work: stacking logic, timer management, replication edge cases, late-join bugs, and an API that works for both C++ and Blueprint users.

GAS solves this but brings a steep learning curve and architectural overhead many projects don't need.

The Solution

AP Replicated Status Effects System gives you a production-ready status effect system in one drag-and-drop component. Add it to any replicated actor. Define effects as data assets - no code required. Apply, query, and react to effects from Blueprint or C++.

Everything replicates automatically. Server-authoritative mutations. FastArray delta serialization. Late-join state reconstruction. Your clients always see the correct state.

Core Features

▸Single Component Architecture - All functionality — application, removal, stacking, immunity, interactions, queries, and events — lives on one component. No manager actors, no subsystems, no GAS dependency.

▸Data-Driven Effect Definitions - Create effects as Data Assets in the Content Browser. Configure duration, tick interval, stacking policy, interactions, and immunity without touching code. Designers iterate on effect balance without recompilation.

▸5 Stacking Policies

• None (Refresh) - reapplication resets the timer

• Stack Duration - each cast extends the timer

• Stack Intensity - each cast adds a stack (poison gets deadlier)

• Independent Instances - separate tracked instances (multiple shield layers)

• Custom Resolver - your own logic via a Blueprint-overridable class
  

▸Tag-Based Immunity System - Grant temporary or permanent immunity to specific effects. Automatic immunity on expiration (e.g., 3s fire immunity after Burning ends). DataTable-driven immunity from interaction rules. Manual GrantImmunity/RevokeImmunity API.

▸Effect Interaction Rules - Define how effects interact with each other - Frozen removes Burning, Innervate breaks Silence, ShieldBreak shatters defensive buffs. Per-definition tag removal, per-definition blocking, and DataTable-based rules with immunity grants. Build complex interaction webs without code.

▸Complete Query API - HasEffect, GetStackCount, GetRemainingDuration, GetEffectSnapshot, GetAllActiveEffects, and more. All queries work on both server and client. Read replicated state with zero latency.

▸Built for Multiplayer - Server-authoritative architecture. FastArray delta replication (bandwidth-efficient - only changed effects replicate). Full late-join state reconstruction. Tested with dedicated servers and listen servers.

▸100% Blueprint Accessible - Every method, every event, every query is exposed to Blueprint. Static helper library with DefaultToSelf convenience. Organized under clean AP > StatusFX categories. C++ users get full access to the same API.

What's Included

• C++ plugin with Runtime and Editor modules

• 30+ preconfigured effect definitions (buffs, debuffs, DoTs, CCs, cleanses)

• 64x64 icons for all effect types

• Interactive demo map with labeled showcase zones

• Demo character with keyboard inputs and Server RPCs

• Buff bar UI widget with icons, countdowns, and stack display

• Effect trigger volumes

• Effect dispenser actors (interactive shrines/pickups)

• DataTable with example interaction rules

• Gameplay Tag hierarchy for the Effect namespace

• Quick Start Guide, full API Reference, and Changelog
  
  

Who Is This For?

• Indie developers building multiplayer games who need buff/debuff systems without the GAS learning curve

• Teams who want a data-driven approach where designers create and balance effects without code changes

• Projects that need reliable multiplayer replication for status effects

• Developers looking for a foundation to build RPG, MOBA, survival, or action game mechanics on top of
  

  
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  The AfterPrime GAS-Free Multiplayer Stack

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  Build complete multiplayer gameplay systems - no GAS required. Every AfterPrime plugin shares the same architecture: server-authoritative, Gameplay Tag-keyed, single component, Blueprint-first, FastArray replicated.
  
  ▸ AP Event Bus - Replicated Event Messaging - FREE Decoupled pub/sub event system with four delivery scopes, a late-join persistent cache, and transparent client-to-server routing.
  ▸ AP Timer Suite - Replicated Timers + Threshold Events - Server-authoritative timer management with threshold callbacks, late-join correctness, and an optional inspector overlay. Timers for cooldowns, match phases, objectives, and more.
  ▸ AP Replicated Cooldowns System - Ability cooldown management with charge systems, global cooldowns, cooldown reduction, shared cooldown groups, and a UI-ready query API.

  ▸ AP Replicated Attributes System - Health, Stamina, Mana, Shield, or any float-based attribute with modifiers, regeneration, and full replication.
  

  All plugins are standalone — use one or combine them for a complete GAS-free multiplayer combat stack.