Upgrade Earplugs Charm through two ranks and it tops out at Earplugs Lv2. The first rank costs 6,000z to craft, every rank after that is an upgrade. Some of the materials only come from Rathalos, Yian Kut-Ku and Zoh Shia.
Rank by rank
Earplugs Charm IRarity 6
Earplugs Lv1: Reduces the effects of weak monster roars.
Craftable · 6,000zEarplugs Charm IIRarity 7
Earplugs Lv2: Nullifies weak monster roars and reduces the effects of strong monster roars.
Upgrade from previous rank · 9,000z