Mana Pool

• Largest # of glyphs ever unlocked in a book they have used
  -Ideally Higher Level Glyphs would provide more Mana, I'll suggest either tier, or tier as a power of 2.
• Advancements, each tier of book provides one, as may certain rituals.
  -This also could provide an effective hook for cross mod interactions.
  -Appropriate equipment and curios.

Mana Regeneration
With my design hat on, I see two valid approaches to mana regen.

1. Percentage of mana per minute. Which also then rewards you for mana pool increases),
2. Flat regeneration. Which makes mana pool increases FEEL more powerful, and which splits your curio choices between capacity and regeneration.

Both of these then open the door to things like mana potions (cordials), and area protections which stop outsiders from recovering mana naturally in your protected areas, as well as incentivize things like locating sacred sites/leylines.
Either should have a base amount,