> ## Documentation Index
> Fetch the complete documentation index at: https://docs.warpathstudios.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Subsystems

> UMAS contains two optional subsystems:

UMAS contains two optional subsystems:

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## **1. AttributeCalcSubsystem**

Handles global calculations.

Responsibilities:

* Provide a global location for custom calculations
* Allow mods and child systems to register dynamic logic
* Compute advanced magnitude formulas
* Cache frequently used calculations for speed

Most users will never touch this directly.

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## **2. EffectSystemSubsystem**

Tracks global effect instances.

Responsibilities:

* Tick world-based effects
* Coordinate cross-actor effect behavior
* Provide global cleanup
* Support async operations (later expansion)

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## **Designer Notes**

* You do **not** need to reference these in normal workflows.
* Advanced users may plug in global modifiers or formula libraries.

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## **Developer Notes**

* Subsystems follow Unreal’s standard subsystem lifecycle.
* Fully multiplayer safe.
* Lightweight — only activated when used.