"A quick note about how Istaria's server works - there are two layers, a core framework written in C++ (what we call “the server”) and game logic (what we call “the simulation”)."
https://community.istaria.com/news/?id=961

Are both written in C++?

"Engine
Intrinsic Alchemy
Mantrid Engine"

https://en.wikipedia.org/wiki/Istari..._of_the_Gifted

Can you explain these two Engine in short?