Power Egg
From Inkipedia, the Splatoon wiki
Power Eggs are a type collectible currency in Splatoon's Hero Mode.
Description
Power Eggs are small, orange orbs that appear similar to fish eggs. Inklings can collect them by directly touching them or splattering them with ink. Although they are often found in the open, they may also be hidden in crates or Octarians. Power Eggs can be used to upgrade players' Hero Mode gear.
Gallery
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An Inkling collecting Power Eggs.
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The upgrades that can be purchased with Power Eggs.