Is it possible to create a dinosaur storage mod for The Isle: Evrima servers?

[biqugeai-pixel]

Is it possible to create a dinosaur storage mod for The Isle: Evrima servers?

[biqugeai-pixel]

I would like to ask if this function can be realized?

[Emruuu]

Legacy The Isle was easier because database edits could be reloaded when the player joined. Evrima appears to cache player save data more aggressively, so we need to force it to reload the save or clear the runtime PlayerData entry. So in theory, but not as a simple “copy save file while the server is running” feature.

[biqugeai-pixel]

Legacy The Isle was easier because database edits could be reloaded when the player joined. Evrima appears to cache player save data more aggressively, so we need to force it to reload the save or clear the runtime PlayerData entry. So in theory, but not as a simple “copy save file while the server is running” feature.

Memory addresses are incredibly hard to find. Do you know of any tools that can locate them quickly?

[Emruuu]

Legacy The Isle was easier because database edits could be reloaded when the player joined. Evrima appears to cache player save data more aggressively, so we need to force it to reload the save or clear the runtime PlayerData entry. So in theory, but not as a simple “copy save file while the server is running” feature.

Memory addresses are incredibly hard to find. Do you know of any tools that can locate them quickly?

evrima_server | [2026.05.10-22.18.03:220][557]LogTheIsleJoinData: [2026.05.10-22.18.03] Emru [] Save file not found - Starting as fresh spawn. Class: BP_Deinosuchus_C, Gender: Male, Growth: 0.250000
evrima_server | [2026.05.10-22.19.39:242][420]LogTheIsleJoinData: [22:19] Emru [] Left The Server whilebeing safelogged, Was playing as: Deinosuchus, Gender: Male, Growth: 0.252215
evrima_server | [2026.05.10-22.28.19:747][992]LogTheIsleJoinData: [2026.05.10-22.28.19] Emru [] Joined The Server. Save file found Dino: BP_Tyrannosaurus_C, Gender: Female, Growth: 0.461268
evrima_server | [2026.05.10-22.29.59:830][976]LogTheIsleJoinData: [22:29] Emru [] Left The Server whilebeing safelogged, Was playing as: Tyrannosaurus, Gender: Female, Growth: 0.461268
evrima_server | [2026.05.10-22.31.36:493][865]LogTheIsleJoinData: [2026.05.10-22.31.36] Emru [] Joined The Server. Save file found Dino: BP_Deinosuchus_C, Gender: Male, Growth: 0.252215
evrima_server | [2026.05.10-22.32.57:900][301]LogTheIsleJoinData: [22:32] Emru [] Left The Server whilebeing safelogged, Was playing as: Deinosuchus, Gender: Male, Growth: 0.254341

I’m actually making good progress on this. I managed to swap a player save without restarting the server.
So yes, it looks possible, but it is not just a file-copy system. It needs:

• player fully offline / safelogged,
• .sav and .sav.bak handled properly,
• a runtime hook/mod to sync or invalidate the PlayerData cache,
• version-specific address checks, because game updates can break offsets.

[biqugeai-pixel]

Legacy The Isle was easier because database edits could be reloaded when the player joined. Evrima appears to cache player save data more aggressively, so we need to force it to reload the save or clear the runtime PlayerData entry. So in theory, but not as a simple “copy save file while the server is running” feature.

Memory addresses are incredibly hard to find. Do you know of any tools that can locate them quickly?

evrima_server | [2026.05.10-22.18.03:220][557]LogTheIsleJoinData: [2026.05.10-22.18.03] Emru [] Save file not found - Starting as fresh spawn. Class: BP_Deinosuchus_C, Gender: Male, Growth: 0.250000 evrima_server | [2026.05.10-22.19.39:242][420]LogTheIsleJoinData: [22:19] Emru [] Left The Server whilebeing safelogged, Was playing as: Deinosuchus, Gender: Male, Growth: 0.252215 evrima_server | [2026.05.10-22.28.19:747][992]LogTheIsleJoinData: [2026.05.10-22.28.19] Emru [] Joined The Server. Save file found Dino: BP_Tyrannosaurus_C, Gender: Female, Growth: 0.461268 evrima_server | [2026.05.10-22.29.59:830][976]LogTheIsleJoinData: [22:29] Emru [] Left The Server whilebeing safelogged, Was playing as: Tyrannosaurus, Gender: Female, Growth: 0.461268 evrima_server | [2026.05.10-22.31.36:493][865]LogTheIsleJoinData: [2026.05.10-22.31.36] Emru [] Joined The Server. Save file found Dino: BP_Deinosuchus_C, Gender: Male, Growth: 0.252215 evrima_server | [2026.05.10-22.32.57:900][301]LogTheIsleJoinData: [22:32] Emru [] Left The Server whilebeing safelogged, Was playing as: Deinosuchus, Gender: Male, Growth: 0.254341

I’m actually making good progress on this. I managed to swap a player save without restarting the server. So yes, it looks possible, but it is not just a file-copy system. It needs:

• player fully offline / safelogged,
• .sav and .sav.bak handled properly,
• a runtime hook/mod to sync or invalidate the PlayerData cache,
• version-specific address checks, because game updates can break offsets.

Is there a way to save a player's dinosaur without logging out of the server, then immediately kill the player's saved dinosaur and force them to start playing with a new one? Could you teach me? Thank you.

[Emruuu]

Is there a way to save a player's dinosaur without them logging out of the server >>The player should log out first to make sure the save is complete and safe. If you copy the save while the server is still writing to it, you risk corrupting the file. So I would not recommend doing that.

As for killing the player's saved dinosaur and forcing them to start with a new one, that should be easy enough with the admin slay command.

[biqugeai-pixel]

Is there a way to save a player's dinosaur without them logging out of the server >>The player should log out first to make sure the save is complete and safe. If you copy the save while the server is still writing to it, you risk corrupting the file. So I would not recommend doing that.

As for killing the player's saved dinosaur and forcing them to start with a new one, that should be easy enough with the admin slay command.

I have a plugin for these mods, but it's encrypted, so I can't crack it to figure out how it works. Do you want the DLL injection file?

[Emruuu]

Is there a way to save a player's dinosaur without them logging out of the server >>The player should log out first to make sure the save is complete and safe. If you copy the save while the server is still writing to it, you risk corrupting the file. So I would not recommend doing that.
As for killing the player's saved dinosaur and forcing them to start with a new one, that should be easy enough with the admin slay command.

I have a plugin for these mods, but it's encrypted, so I can't crack it to figure out how it works. Do you want the DLL injection file?

I confirmed that multi-slot support in The Isle: Evrima is possible without a full server restart: swapping .sav/.sav.bak works as long as the player is offline or safely logged out, and the runtime PlayerData cache is synchronized during LoadPlayer.
I found the key mechanism: the server compares a token from the save file against a token cached in memory. I built a working LD_PRELOAD hook that updates this cache automatically, allowing the swapped dinosaur save to load normally without GDB or a server restart.
I don’t know how others are doing it, but this is my approach, and it already works. I made a Linux version because my server runs on Linux.

[biqugeai-pixel]

If I were to develop this myself, how should I go about it?

[Emruuu]

I mostly use AI to help with this. A lot of diging was to do. But on the end problem was here:

Hope it will help you in some way. I can ask to generate .DLL file but i dont know if the memory access for windows client will be the same.

[biqugeai-pixel]

The development team needs to identify and capture the specific memory addresses (RAVs) within the game server.

[Emruuu]

The development team needs to identify and capture the specific memory addresses (RAVs) within the game server.

For the Windows version, we do not really need raw absolute memory addresses, because those can change every time the server starts due to ASLR.

What we need are RVAs/signatures for the same logic path I found on Linux.

The important target is the LoadPlayer flow, specifically the point after the save file is parsed into PlayerData and before the server compares the save token against the cached runtime token.

On Linux, the confirmed hook point does this:

• read token from parsed PlayerData
• write that token into the runtime PlayerData cache entry
• continue the original comparison

For Windows, you can help by finding the equivalent location in TheIsleServer-Win64-Shipping.exe.

Useful things to collect:

1. exact server executable version
2. SHA256 hash of TheIsleServer-Win64-Shipping.exe
3. module base address at runtime
4. RVA of the equivalent LoadPlayer/token comparison code
5. original bytes at the hook point
6. a short instruction dump around the hook point
7. ideally a byte-pattern/signature that survives updates better than a fixed address

Tools that can help:

• x64dbg
• WinDbg
• Cheat Engine for inspection only
• Ghidra or IDA for static analysis
• Process Hacker / Process Explorer to check module base addresses
• dumpbin / PE-bear / CFF Explorer for PE info

The easiest path is to search the Windows binary for the same Unreal/reflection symbols or nearby function names:

• LoadPlayer
• MinimalPlayerLoad
• StringToPlayerData
• PlayerDataToString
• IsPlayerDataSaved
• DeletePlayerData
• TIPlayerData
• PlayerSteamId / SteamID

Then trace the LoadPlayer function until you find the same logic:

• save file gets read
• StringToPlayerData parses it
• token from parsed PlayerData is compared against cached values
• cached values are stored in a per-player runtime map/cache

On Linux, the key behavior was:

token_from_save = PlayerData + 0x0
cache_value_0 = cache_entry + 0x10
cache_value_1 = cache_entry + 0x14

The Windows offsets may be the same or slightly different, so they need to be confirmed in a debugger.

Once he finds the Windows equivalent, he should send:

• executable SHA256
• hook RVA
• return RVA
• original bytes at hook site
• register state at hook site
• where the parsed save token is stored
• where the cache entry pointer is stored
• instruction dump 20-30 lines before and after the hook point

[biqugeai-pixel]

Thank you for the development tutorial.

[Emruuu]

I spent a lot of time working on this myself, so I hope it helps you accomplish it faster too.

[biqugeai-pixel]

https://github.com/Do0ks/GSpots
https://github.com/UE4SS-RE/RE-UE4SS/releases
https://github.com/Encryqed/Dumper-7
https://dumpspace.spuckwaffel.com/Games/?hash=31c3e436&type=functions&idx=APCGWorldActor
Are these tools useful for development?