From Zelda Wiki.org
Plasmarine (プラズマリン,
Purazumarin) was a jellyfish-like boss that haunted the inner bowels of
Jabu Jabu's Belly in
Oracle of Ages. Link had to fight this beast to acquire
Rolling Sea, the seventh of eight
Essences of Time necessary to restore power to the
Maku Tree and destroy the sorceress
Veran. Plasmarine had two attack modes: blue, in which it hunted down targets and shot bolts of electricity at it, and red, when it attempted to electrify itself to hurt nearby intruders. Link destroyed the creature by using the
Long Hook to flip Plasmarine onto its own electrical bolts. As the creature died, it left the
Rolling Sea unguarded, which Link immediately added to his almost-complete collection of Essences.
Strategy
Plasmarine is arguably the easiest boss in Oracle of Ages, compensation for an annoying dungeon. By waiting until Plasmarine attacks, Link would then use the Long Hook to swap positions with Plasmarine, forcing it to take its own attack. Its red attacks would injure its blue form, and vice versa.
