The Spider (actual name Hämis) is a small, but aggressive three-legged critter that can deal a surprising amount of melee damage to new players.
Behavior
Spiders are often found in packs, sometimes up to 7-8 at once. Packs also spawn from breakable pots in the Pyramid. Their numbers might make them somewhat annoying to deal with, as their corpses and gold nugget drops will block player shots when they are packed tightly together.
Spiders can sometimes be observed consuming corpses.
It is rumored that they actually have a preferred consumable material, chosen at the start of every run. They will become more aggressive towards creatures stained with their favorite food. If they eat enough of their favorite food, they will multiply and ultimately create a pack. (A proper investigation should be conducted.)
Trivia
Since these enemies are often found in packs, using explosive crates/barrels on them can be a good way to get money at the beginning of your run, as "accidental" kills will yield double gold. Due to their low health, fire from dropped lanterns is also effective for this, as they will jump in panic ignoring the player.
These enemies appear to be the juvenile form of the Lukki and Hämähäkki found in the Jungle as indicated by their three eyes and spider-like appearance.
These enemies make an appearance in the game Environmental Station Alpha, a metroidvania by Arvi Teikari, who is a part of Nolla Games.