diasurgical/devilutionX

[Issue Report]: Missiles aren't synced in multiplayer

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#8412 opened on Jan 9, 2026

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help wanted

Description

Operating System

Windows x64

DevilutionX version

1.5.5

Describe

Missiles are not synced in multiplayer since they are not saved to the delta. Therefore, players entering a level will not see existing missiles. This is especially problematic with the use of wall spells.

Would be fixed by: https://github.com/diasurgical/DevilutionX/pull/2787

To Reproduce

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Expected Behavior

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Additional context

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Contributor guide

Tech stack
cpp
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C++Multiplayer networkingDelta sync mechanism
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the delta synchronization mechanism for missiles in devilutionX. Look at how other projectiles are saved to the delta and apply similar logic to missiles. Examine the linked PR #2787 for proposed changes to relevant files such as missile.cpp and delta.cpp. Ensure proper syncing on level entry by testing both client and server behavior.