Gastropod

The Gastropod is a flying Hardmode slime that appears frequently at the surface of The Hallow at night, and fires lasers. Gastropods are immune to the Poisoned debuff.

Tips

 * Newer Hardmode players may want to avoid The Hallow's surface at night entirely, as Gastropods fire frequently, spawn often, and their lasers are difficult to dodge -- especially when more than one Gastropod is on the screen (and there usually will be more than one).
 * Gastropods drop much more Gel than any other Slime, making them useful for gathering Flamethrower ammo. Killing Gastropods with one is fast and will yield more Gel than you use.
 * The Bee Gun or similar weapons are effective at preventing Gastropods from firing, as its bees can attack continuously, leaving no pause for Gastropods to fire.
 * Using the Royal Gel will make you immune to Gastropods entirely.

Trivia

 * In a state of being beyond that of Terraria (real life), Gastropods are a class of mollusk that includes snails and slugs. The word "gastropod" is derived from ancient Greek meaning "stomach-foot," which these animals are so named because they appear to crawl on their stomachs.

History
Gastéropode