Aquamentus

For The Legend of Zelda on the Nintendo Entertainment System (NES).

From the manual

A kind of dragon called a unicorn. It attacks by firing beams.

Translated from the Japanese manual.

Enemy

Kind	Boss
Japanese name	アクオメンタス

Official art

From the official guides

A kind of dragon known as a unicorn. Its attack is strong, and it shoots beams, which makes it a tough enemy.

ゼルダの伝説取扱説明書 (任天堂, 1986), p. 36, 101Leafy's translation

A kind of dragon known as a unicorn. Its attack is strong, and it shoots beams, which makes it a tough enemy.

ゼルダの伝説1 取扱説明書 (任天堂, 1994), p. 30, 101Leafy's translation

A type of dragon that some call a unicorn. As well as having lots of attacking power, it's a fearful opponent. It emits mean beams.

The Legend of Zelda Instruction Booklet (Nintendo of America, 1987), p. 37

Tough enemies, these are a kind of dragon called a unicorn monster. Its offensive power is especially strong because of the beams it emits in three different directions. The secret to fighting with Aquamentus is to dodge its beams. The magic shield reflects Aquamentus' beams.

The Legend of Zelda Tips and Tactics (Tokuma Shoten Publishing for Nintendo of America, 1987), p. 25

The monster guard to the Triforce is called Aquamentus. Attack his head with your sword. With the Magic Shield, you have nothing to fear.

The Legend of Zelda (Nintendo Power) (Nintendo of America, 1988), p. 28

A unicorn that fires three beams at once. Sword beams, bombs, and arrows work well, but always hit it from the neck up. Its body cannot be hurt.

ゼルダの伝説 (二見書房, 1986), p. 71, 101Leafy's translation

A one-horned beast that lives deep in the labyrinth and spits beams. Watch out, because the small shield cannot block them.

ゼルダの伝説必勝攻略ガイド (新星出版社, 1986), p. 23, 101Leafy's translation

The strongest enemy in the Eagle Labyrinth (Level 1). A kind of dragon called a unicorn, it fires beams.

ファミリーコンピュータ攻略ガイドブック1 ゼルダの伝説 (曙出版, 1986), p. 25, 101Leafy's translation

A unicorn. It fires beams and is quite tough. Bombs can defeat it too.

ファミリーコンピュータ必勝シリーズ1 ゼルダの伝説 (ミリオン出版, 1986), p. 30, 101Leafy's translation

A unicorn, so to speak, that fires beams and is tough as well. Dodging its three beams looks hard, but the horizontal line right through the middle is a blind spot. Remember that and there is nothing to fear.

ファミコンマル勝DXシリーズ1 ゼルダの伝説 (角川書店, 1986), p. 54, 101Leafy's translation

A dragon called the unicorn. Watch out: its attacks are strong, and it fires beams too. The best way to defeat it is to throw your sword beam at its head from the other side of the room. Whatever you do, aim for the head!

ゼルダの伝説 (秋田書店, 1986), p. 52, 101Leafy's translation

Its weapon is a beam cannon that fires in three directions. It moves slowly back and forth over a set distance.

ゼルダの伝説 (双葉社, 1986), p. 20, 101Leafy's translation

A kind of dragon with a horn on its head, called a unicorn. Its attack isn't very strong, but it fires beams. For Link it is a truly tough monster.

ケイブンシャの大百科別冊ゼルダの伝説1 (勁文社, 1994), p. 29, 101Leafy's translation

A kind of dragon, a huge one-horned beast. It never leaves its spot, but it attacks by firing beams. If you keep from getting hit by them, it is not very tough. Hitting it with two Bombs works well.

ゼルダブック (ファミコン必勝本 1986年6月号付録) (JICC出版局, 1986), p. 74, 101Leafy's translation