Blue Bari

For The Legend of Zelda: A Link to the Past on the Super Nintendo (SNES).

Where it is

From the official guides

A jellyfish-like monster that lives in dungeons. Every so often it lets off the electricity in its body, and cutting it with the sword then gives Link a shock. Attack with the hookshot.

ファミコン通信編集部責任編集ゼルダの伝説神々のトライフォースのすべてがわかる本 (アスキー, 1992), p. 105, translated by 101Leafy

It hardly moves, like a jellyfish drifting on the waves. While it is buzzing you cannot hurt it. When the shock dies down, use the sword.

任天堂公式ガイドブックゼルダの伝説神々のトライフォース上巻 (小学館, 1992), p. 130, translated by 101Leafy

Numbers

Hit points	2
Damage to Link, Green Mail	½ heart
Damage to Link, Blue Mail	½ heart
Damage to Link, Red Mail	½ heart

Weapons

Boomerang	No effect
Fighter's Sword	1 hit
Master Sword	1 hit
Tempered Sword	1 hit
Golden Sword	1 hit
Golden Sword spin attack	1 hit
Arrows	1 hit
Hook Shot	1 hit
Bombs	1 hit
Silver Arrows	Defeats it in one hit
Magic Powder	No effect
Fire Rod	Burns it
Ice Rod	1 hit
Bombos Medallion	Burns it
Ether Medallion	1 hit
Quake Medallion	Stuns it