NCF – Extended list of Neutral creatures.

Initially, magic is inherently chaotic – it is a disorderly interweaving of all elemental schools.

Actually, it is not disorderly because, firstly, it does not consist of elemental schools in itself (Asra created the elements from the initial magic, and not vice versa – that is, the initial magic is present in the elements, but the elements are not present in the initial magic). Secondly, since the elements were created by Asra, they are initial magic associated with order, not chaos.
Demonic creatures mostly use:
1) Initial magic in its pure form (spatio-temporal spells, including opening portals between dimensions)
2) Chaos magic (a form of initial magic corresponding to Urgash)
3) Elemental magic corrupted/modified by Chaos
P.S. Everything I write comes directly from the lore, not from my imagination.
P.P.S. It should also be remembered that the lore of the fifth part somewhat conflicts with the lore of the 6th and 7th parts (for example, in Heroes 5, demons prefer darkness, although the T.E. almost does not study it:smile07: - in my opinion, this is complete nonsense)