Hi ShadowDarkblade and Welcome to ROG 😄

Try starting your system with just one DIMM in first slot and switching them around.
If your system then starts and doesn't shut down, test your DIMMs with Memtest86+

Are there any critical issues in event viewer?

Some have experienced this issue due to GPU driver installation. Try rolling back or updating your graphics driver.

Check Power plan settings in Windows.

A number of things can cause this in W10. report back with the above first.

BTW, You do have both 8pin and 4pin sockets occupied on the MB? Just checking.

Ok lets continue troubleshooting.

To eliminate the possibility that somehow your Windows registry has been corrupted, Run "sfc /scannow" in an elevated prompt without the quotation marks.
Should the scan indicate errors and can't fix them then some apps may be the cause. If it has repaired your registry and the issue continues, we will have to delve deeper.
Keep an eye on your Qcodes during post, especially if it alts for some time during the DXE initialization phase Qcode 73-77. report any anomaly.
Ensure RAM timings are correctly configured in Bios. Key in manually your XMP profile and voltage.
Indicate any OC or changes you have made in Bios.

Report back with results.

Next to consider are startup programs, Turn off any not needed or try delayed start. Be careful here if not sure of a service then google it.

The CBS log can be difficult to determine (and its long) where the fault lies and needs scrutiny at the W10 forum, you can look at it using a text editor, run as admin and see if anything obvious.

I would consider a system repair or a complete OS re-install if no luck with the CBS Log. Would save further frustration.
I know its a pain if you've had Windows for a while, but no problem if its been a new installation.

If when post gets to AA or AC, It means a successful transition to ACPI mode and hands over to your OS. If then the crash occurs then generally it is Windows related.

Qcode 66 is a CPU DXE initialization error. Has this just started to happen? cause normally your post will not advance till rectified.

A little more insight:

"Driver Execution Environment (DXE) Phase. There are several components in the DXE phase and it is where most of the system initialization is performed.
The Dxe Core produces a set of Boot Services, Runtime Services, and DXE Services.
The Dxe Core is composed of boot services code, so no code from the Dxe Core itself is allowed to persist into the OS runtime environment.
Only the runtime data structures allocated by the Dxe Core and services and data structured produced by runtime DXE drivers are allowed to persist into the OS "runtime environment".
These components work together to initialize the platform and provide the services required to boot an operating system.
The DXE phase and Boot Device Selection (BDS) phases work together to establish consoles and attempt the booting of operating systems.
The DXE phase is terminated when an operating system is successfully booted.

Although Qcode 66 is usually related to the DIMMs you are using, I see you have tested them. So that should not be the issue.
Another way to see is to swap them out with another kit. Please list the exact specs and are they listed on the ASUS QVL for your MB?.
You will have to eliminate this possibility.

Re-installing your OS is no guarantee of a fix. Try to repair first.