Memoria Freese skill Material Killer

Memoria Freese skill Material Killer - Photo of Woman Using Sewing Machine

So I got one Lefiya (Incantation) who has an ability Material Killer: Ability pt. +50% toward Material. However I used her in both Rampage and regular stories with no apparent increase in either quantity or quality of drops. Any idea what this skill does?

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Complete Resource \u0026 Materials Guide // Back 2 Basics // Danmachi Memoria Freese 2020

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