# Sub-Task 8: Mana System Conversion Regen Deduction (Bug 10)

## Scope
- **Core files affected**:
  - Mana system logic (e.g., `utils/manaUtils.ts`, `hooks/useMana.ts`)
  - Mana regeneration calculation functions
  - Mana state management (e.g., `store/manaSlice.ts`)
- **Files potentially affected**:
  - `types/mana.ts` (mana type definitions, conversion rates)
  - Any components displaying mana regen rates (to show effective vs raw regen)
  - StatsTab (will be updated in Sub-Task 9 to show conversion drains)

## Acceptance Criteria
1. Mana conversion rates (from attunements) are deducted from raw mana regeneration rate
2. Example: 3.8 raw regen − 0.2 transference conversion = 3.6 effective raw regen (verify via calculation checks)
3. Effective regen is used for all mana regeneration in-game
4. Conversion drains are properly tracked and available for UI display (needed for Sub-Task 9)

## Dependencies
- None (independent, but Sub-Task 9 depends on this)

## Estimated Complexity
- Medium (mana calculation logic update)