(My first language is russian, so forgive me for any possible misunderstanding)

While playing as a demon and making cyrographes with mortals is fun for the first decades, at a certain point contracts become useless. Do you plan to add any modifiers for the last-tier demon contracts? What do you think about introduction of soul-trading system between demons? You can implement this as a continuation or alternative to the demon-summoning. It would be nice to gain various small scailing modifiers for every sold soul.

Or you can make souls some kind of fuel to recharge powerful spells cooldown in any moment.

And i have another question: why person who sold soul to the demon must die to benefit the demon? Why not make an alternative in the form of a new character ineraction similar to the domination spell, but with more options and faster reload time?

In short, it would be nice to see an expanded and less useless soul-trading system.