A huge bug that stretches from the ground to the sky. You can't defeat it unless you inflict damage to its head.
Geldarms are very tall, centipede-like Enemies that stretch up directly into the air,[2][3] waving in the wind of the desert regions they live in. Geldarms emerge from below the surface and retreat into the Sand if their bodies are struck with Link's Sword. As the Geldarms retract into the Sand, a few slashes with the Sword to their head will be more than enough to destroy them.[4] They are more of a path-blocking nuisance than a dangerous foe, but the rocks that fly around in the deserts are hard to avoid when dealing with these enemies. Despite their size, they are not actively hostile and typically eat nearby Insects.[3] Their whole bodies are poisonous, damaging Link on contact.[3]
Its name is similar to that of the Geldman, another desert-faring creature. In Japanese, "Geld" is written and read the same as "Gerudo", suggesting a connection between the sand monsters Geldarm and Geldman, and the desert or beach-dwelling Gerudo race featured in later games. This connection is lost in translation. This is the first use of the word Gerudo in the series.
The アーム (Āmu) in their Japanese name is shared with other enemies such as Moldorms in the original The Legend of Zelda (モルドアーム (Morudoāmu)) and Pincer (ホールドアーム (Hōrudoāmu)), suggesting a relation between these enemies.
↑A huge bug that stretches from the ground to the sky. (The Adventure of Link manual, pg. 27)
↑ 3.03.13.2Long centipede-like monsters that live in the desert. Despite their size, they are relatively calm, content to eat bugs that draw near. Attacking one will cause it to retract into the sand, making it possible to aim for its head, a weak point. Its entire body is poisonous; touching any part will hurt Link. (Encyclopedia, Dark Horse Books, pg. 179)
↑You can't defeat it unless you inflict damage to its head. (The Adventure of Link manual, pg. 27)
↑"How can I help you, masters?" — Geldarm (Captain N: The Game Master, Episode Having a Ball)
↑Sconfiggi un Geldarm senza subire danni! (Defeat a Geldarm without getting hit!) — Level 2-1 (NES Remix 2, Italian version)