Hi now I tried again and It works but I have problems with the Weapon effects.
Item + DBC:
https://puu.sh/x01OE/b344926aa6.JPG
Column 13 = 8
It would be nice if some one can help me with that.
You will not find reference to those textures in the DBC, because i bellieve they are hardcoded into the model itself. (Correct me if i am wrong im not a master in modelling

)
Open the M2 file with 010 or hxd and search (ctrl+f) for .blp then you will find the textures that you are missing. Then just download or extract the required files from legion and put them in a patch with the same path that is in the .m2. I personally searched for similiar textures in the already existing ones and renamed them for my ashbringer.
And thanks nupper for his amazing work of course!

Here are some pictures:
