Originally Posted by
anaximander19
Some of the 3.5e vestiges support this brilliantly (off the top of my head, I remember there's a 4th-level that gives Find Steed, and there's a 1st-level that gives dwarf Stonecunning, etc) so the idea of keeping lower-level vestiges for niche benefits is spot on. As for the availability, that's partly why I'm keeping 3.5e's name/title/seal idea - even knowing a vestige's name isn't enough; you need to find and learn its seal so you can draw it during the ritual. This allows the DM to limit the availability of vestiges, and opens up some plot hooks for quests to find the seal of some powerful vestige.