Groo on Steam said I should copy my post there, to here. So here goes.

Issue: Unless I reboot, the game crashes on the Logo Splash Screen, I can tell instantly if it's going to crash however, because when it "Works" it has the Tempest Splash Screen, when it doesn't work, it has the base game Splash Screen.

Things I've Already tried to do- Run in compatibility mode, re-install the game, update my graphics drivers, update windows, update my audio drivers, run sfc/scannow, repaired the game, verify integrity of game cache, run as admin, updated flash, set my Documents folder from read-only to "not" read-only, updated directx, uninstalled and reinstalled directx, re-installed and repaired Microsoft FrameWork, turned off firewall, turned off Virus Protection.

Specs- Windows 10 Home 64Bit (10.0 Build 14393) I'll note I upgraded from Windows 7
Proc: Intel(R) Core(TM) i7-3930k CPU @ 3.20 GHZ (12 CPUs), ~3.2 GHZ
Memory: 32768Mb RAM
DirectX Version: DirectX 12
REsolution 1920X1080
Most of this is pulled from the first screen of DXDiag, with the exception of the Resolution.

Version- Non-issue? As the game never lets me get to the main menu anyway. It's whatever the newest version of the game is.

Outputlog.txt

Initialize engine version: 5.3.6p1 (ef59fdfbd254)
GfxDevice: creating device client; threaded=1
Direct3D:
    Version:  Direct3D 9.0c [nvd3dumx.dll 21.21.13.7866]
    Renderer: NVIDIA GeForce GTX 1060 6GB
    Vendor:   NVIDIA
    VRAM:     6084 MB (via DXGI)
    Caps:     Shader=30 DepthRT=1 NativeDepth=1 NativeShadow=1 DF16=0 INTZ=1 NULL=1 RESZ=0 SlowINTZ=0
Begin MonoManager ReloadAssembly
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\UnityEngine.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\UnityEngine.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\I18N.dll (this message is harmless)
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\I18N.West.dll (this message is harmless)
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Assembly-CSharp-firstpass.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Assembly-CSharp-firstpass.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Assembly-CSharp.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Assembly-CSharp.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Assembly-UnityScript-firstpass.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Assembly-UnityScript-firstpass.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\UnityEngine.UI.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\UnityEngine.UI.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\UnityEngine.Networking.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\UnityEngine.Networking.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.Endless.Fantasy.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.Endless.Fantasy.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.WorldGenerator.Embedded.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.WorldGenerator.Embedded.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.WorldGenerator.Generator.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.WorldGenerator.Generator.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.WorldGenerator.Graphs.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.WorldGenerator.Graphs.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\clipper_library.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\clipper_library.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Amplitude.dll into Unity Child Domain
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\ICSharpCode.SharpZipLib.dll (this message is harmless)
Loading C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\ICSharpCode.SharpZipLib.dll into Unity Child Domain
- Completed reload, in  0.099 seconds
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\System.Core.dll (this message is harmless)
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\System.dll (this message is harmless)
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\System.Xml.dll (this message is harmless)
<RI> Initializing input.

<RI> Input initialized.

desktop: 1920x1080 60Hz; virtual: 3840x1080 at 0,0
<RI> Initialized touch support.

UnloadTime: 0.921039 ms
Default codepage number is 437.

(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37)

Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Mono.Security.dll (this message is harmless)
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\System.Configuration.dll (this message is harmless)
Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\System.Drawing.dll (this message is harmless)
Unloading 4 Unused Serialized files (Serialized files now loaded: 0)
UnloadTime: 0.474271 ms

Unloading 3 unused Assets to reduce memory usage. Loaded Objects now: 4518.
Total: 0.853880 ms (FindLiveObjects: 0.212350 ms CreateObjectMapping: 0.212030 ms MarkObjects: 0.419584 ms  DeleteObjects: 0.007995 ms)

Unloading 3 Unused Serialized files (Serialized files now loaded: 0)
UnloadTime: 0.465316 ms

Unloading 13 unused Assets to reduce memory usage. Loaded Objects now: 4515.
Total: 0.626178 ms (FindLiveObjects: 0.080590 ms CreateObjectMapping: 0.159902 ms MarkObjects: 0.368415 ms  DeleteObjects: 0.016949 ms)

DontDestroyOnLoad only work for root GameObjects or components on root GameObjects.

(Filename:  Line: 374)

Platform assembly: C:\Steam\steamapps\common\Endless Legend\EndlessLegend_Data\Managed\Boo.Lang.dll (this message is harmless)
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/fmod_event_net64.dll
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/.\fmod_event_net64.dll
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/fmod_event_net64.dll
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/fmod_event_net64
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/.\fmod_event_net64
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/fmod_event_net64
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/libfmod_event_net64.dll
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/.\libfmod_event_net64.dll
Fallback handler could not load library C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/Mono/libfmod_event_net64.dll
Failed to initialize the Steam API; aborting...

(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37)

An exception has been raised while initializing the application managers.
System.NullReferenceException: Object reference not set to an instance of an object
  at Amplitude.Unity.Localization.LocalizationManager+<BindServices>c__Iterator76.MoveNext () [0x00000] in <filename unknown>:0
  at Amplitude.Coroutine.Run () [0x00000] in <filename unknown>:0
  at Amplitude.Coroutine+<EnumerableRun>c__IteratorA2.MoveNext () [0x00000] in <filename unknown>:0

(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37)

Setting up 3 worker threads for Enlighten.
  Thread -> id: 2ffc -> priority: 1
  Thread -> id: 1d88 -> priority: 1
  Thread -> id: 23c8 -> priority: 1
Disposing(False)...

(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37)

Disposing(False)...

(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37)


Diagnostics.html

17:12:11:303STACKStarting the application, version is V1.5.13 S3 (64-bit)...

17:12:11:304STACKRunning 64-bit mode...

17:12:11:304STACKGame directory is "C:\Users\Regal\Documents\Endless Legend".

17:12:11:304STACKLoading registry file 'C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/..\Registry.xml'...

17:12:11:305STACKRegistry file 'C:\Users\Regal\Documents\Endless Legend\Registry.xml' does not exist.

17:12:11:305STACKLoading registry file 'C:\Users\Regal\Documents\Endless Legend\Users\0\Registry.xml'...

17:12:16:454STACKThe audio manager is activated: creating the fmod event system...

17:12:16:454STACKSetting up the fmod system...

17:12:16:454STACKInitializing the fmod event system...

17:12:16:454STACKLoad fmod data from folder 'C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/../Public/Audio/'.

17:12:16:454STACKPath 'C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/../Public/Audio/' made relative to working directory 'C:\Steam\steamapps\common\Endless Legend\', result: 'EndlessLegend_Data\..\Public\Audio\'.

17:12:16:455STACKRooted path 'C:/Steam/steamapps/common/Endless Legend/EndlessLegend_Data/../Public/Audio/' has been made relative into 'EndlessLegend_Data\..\Public\Audio\'.

17:12:16:455STACKPlaying with 1 downloadable content(s): Endless Day.

17:12:16:455STACKFailed to initialize the Steam API; aborting...

17:12:16:455STACKShutting down...

17:12:16:455STACKChanging display settings to 1280x720, 60Hz...

17:12:16:455STACK... switching to 1280x720 (60) windowed...

17:12:16:455STACKSetting the general quality level to '3'.

17:12:16:473STACKAn exception has been raised while initializing the application managers. System.NullReferenceException: Object reference not set to an instance of an object at Amplitude.Unity.Localization.LocalizationManager+c__Iterator76.MoveNext () [0x00000] in :0 at Amplitude.Coroutine.Run () [0x00000] in :0 at Amplitude.Coroutine+c__IteratorA2.MoveNext () [0x00000] in :0

17:12:16:473STACKShudown complete.

17:12:16:473STACKResolution has been changed.

17:12:16:473STACKCameraManager.VideoSettingsService_ResolutionChange.

17:12:16:474STACKResetting Camera Aspect has been changed 1.777778 -> 1.777778.

17:12:16:474STACKFlush diagnostics before closing streams.

We had a very similar (if not identical) issue here : https://www.games2gether.com/endless-legend/forum/13-tech-support/thread/21738-game-crashes-at-startup

Basically, there's a problem somewhere between EL and Steam.

This is mentioned in the Outputlog.txt log file:

An exception has been raised while initializing the application managers.
System.NullReferenceException: Object reference not set to an instance of an object
at Amplitude.Unity.Localization.LocalizationManager+<BindServices>c__Iterator76.MoveNext () [0x00000] in <filename unknown>:0
at Amplitude.Coroutine.Run () [0x00000] in <filename unknown>:0
at Amplitude.Coroutine+<EnumerableRun>c__IteratorA2.MoveNext () [0x00000] in <filename unknown>:0

And also in the Diagnostics.html log file:

17:12:16:473STACKAn exception has been raised while initializing the application managers. System.NullReferenceException: Object reference not set to an instance of an object at Amplitude.Unity.Localization.LocalizationManager+c__Iterator76.MoveNext () [0x00000] in :0 at Amplitude.Coroutine.Run () [0x00000] in :0 at Amplitude.Coroutine+c__IteratorA2.MoveNext () [0x00000] in :0

Did you already try un-installing and re-installing the Steam client altogether?

I have not, if I'm being honest I was really hoping to avoid uninstalling/reinstalling Steam as to the best of my knowledge, that means re-DLing all the games which is a chore and a half, same with doing a hard drive wipe and re-installing Windows, if I have no other choice though, I guess that's what I'll do.

Didn't reinstall steam client ever, but is it possible the games still remain (to not be forced to download again...) ?

For what it's worth literally just ending the steam.exe and reloading it fixed this issue for me.

Nice to know - thanks for posting your solution! 

Happy gaming ^^