in it find the line <Sound/> and replace it with <Sound href="/Sounds/_(Sound)/Heroes/Wizard/move.xdb#xpointer(/Sound)"/>
with Razzak it's more complicated - he has no effects, so he uses the vanilla mage animation set (which is not in the mod)
there are 2 ways to solve the problem
the first one is simple, but it may cause a bug if the LOD animation doesn't fit the battle model, but that's not the point, it's worth trying
folder \Characters\Heroes\Academy\Razzak\ file Wizard.(Character).xdb
there are lines
<ArenaAnimSet href="/Characters/Heroes/Wizard-arena.xdb#xpointer(/AnimSet)"/>
<AdvMapAnimSet href="/Characters/Heroes/Wizard-arena.xdb#xpointer(/AnimSet)"/>
as you can see, one line is responsible for arena animations, the second one for the map, the hero only walks on the map, so you need to replace the second line with
<AdvMapAnimSet href="/Characters/Heroes/Wizard_LOD-adv.xdb#xpointer(/AnimSet)"/>
in the vanilla game different models are used for the map and the arena, but here there's only one, so there's a chance the model and animations won't fit each other, it's easy to notice - the magic wands might fly off to the side, or the hero might stand in a T-pose, then you'll have to revert the changes and do the following
in data.pak in the folder \Characters\Heroes look for the file Wizard-arena-move.xdb - do the same with it as with Nathir's same file, save it somewhere, and put it into the mod in the folder \Characters\Heroes