The Sandcrawler is an enemy in Final Fantasy V met in the large desert south of the Moogle Village. The moogle the party follows to the village tells not to enter the sand, probably because of this overpowering enemy.
Sandcrawler frequently uses Maelstrom to reduce the party's HP to single digits. They have plenty HP compared to other enemies in the area but, due to being desert monsters, are weak against Aqua Breath. An easy win involves using a Mystic Knight or someone equipped Spellblade at job level 5, and having him/her learn Break: using Break on the Spellblade kills Sandcrawler instantly.