This is a traceable player route, not an in-house test or an official recommendation. Use it as a route to verify in your own run.
Build identity
A community build list pairs Staff with Grimoire. Official historical notes also show that Grimoire MP cost is a supported artifact interaction, which makes resource efficiency a reasonable constraint to watch rather than an invented mechanic.
Decision rule
Use Staff as the anchor and evaluate Grimoire choices by whether the run can sustain their MP demand. Rylie's Pocket Watch has an official historical record of gaining a Grimoire MP Cost reduction effect, but its current complete values still need an in-game check.
- Anchor: Staff
- Engine: Grimoire
- Constraint: MP sustain
Limits
The sources do not establish a complete optimal list or current damage comparison. Keep this route community-labelled until a reproducible version 1.0.21 run is recorded.