Then as it's presented here, I created the cristal and its base following these steps : ZBrush sculpting, ZBrush retopology, ZBrush UV's, Substance 3D Pt baking and texturing. As for the terrain, I used Side FX Houdini not as an HDA export because as I'm using the Apprentice version their is no way to install the Houdini Unreal Engine Plug in UE, its simply doesn't exist for this free version of Houdini unfortunately, but it didn't really bother me neither stopped me as I made a retopology using Zbrush.
ZBrush is amazing for lots of possibilities it offers, I appreciate to create retopology using it, it's so practical and powerful + time winning.
Then after the UV's I painted the textures in Substance 3D Pt and exported it in UE.
It took me many hours to find a way to create all the nodes chain for the cristal material, as I wanted it to look like an ice cube or something like that. I finaly found some documentations on the internet and then it helped me a lot (https://vegabeyond.com/2020/03/28/UEMaterial-IceAndCrystal/) and I tweaked very little things and I really enjoy the result.
I love Unreal Engine 5 and all the improvement it has been made since the previous versions 4! And I tend to use it more and more for all the real time job I have to achieve. So finaly I also created a little FX to get into Niagara a bit more than usualy and placed it around the cristal base. I rigged and animated the Cristal in Blender. And I ended this course adding a post-process Blur combined with the actual default Motion blur of UE I made and used the UE sequencer which is great + Adobe premiere with a copyright free sound track I found out on the internet.