Myself and one of my players who I frequently let CO-DM for me were wondering if there were any rules in D&D 3.5 for a low level player becoming a demon prince.
The demon prince should give powers similar to a Balor or Abraxas The Unfathomable, but appropriate for a lower-level party.
These rules dont have to be core and can be home-brew.
To clarify atm the party is around level 6 to 7 and will be most likely getting to level 12 in the next session.(They are fighting in a tournament with one on one opponents so they get all the xp to themselves).
I intend for the player to have gained something similer to a divine spark but have it instead be a demon lord spark. It would essentially be a level 0 spark where he would maybe gain a template or a prestige class called demon lord, and then work his way to demon prince at level 20 of that class. Along the way he would gaining power in the class. (With the party is around 6 to 7 now, there is only one player that will have this chance to become that class. The prize from winning the tournament will be the chance to become that class/prestige class).